Optimum Nutrition Serious Mass Review

Thanks man, that’s a great review you have there!

I’m planning to get the 6lb and trying to calculate my servings per month.

Given that I’d probably be having one serving of a one scoop per day, how long do you think the bottle will last for me?

And by doing so, how soon would I be able to see the results if my workouts are some how moderate in intensity as in 3 hours per week?

One more thing if I may, as for a female, would this work as a proper weight gainer?

And how effective would it be if one is not working out sufficiently yet have an active day, be for a male or a female please?

Pardon me for the pile of questions but any help would count big mate.

Hi Mohammed, thanks for your comment.

OK, so bear with me while I calculate this in metric measurements.

A single serving of Serious Mass is 167g, so 2721.55/167 = 16.3

So if you take a single serving a day, it will last you around 16 days.

If you train consistently with heavy compound lifts and consume enough calories/protein, you should definitely begin to see results.

Male or female, this product will help you up your calorie intake for size gains, but if you're not training hard and eating crap, you WILL get fat.

Hope that helps, let me know if you have any further questions!

You said when you started using one scoop (700 calories, 25g protein), you topped it with Impact Whey Protein, so that you could consume more protein.

I’d like you to give more details on that.

Because I’m planning to consume 1 scoop of Serious Mass (1 scoop, not 1 serving!) mixed with milk after my workouts.

I workout 4 times a week, so after every workout one scoop.

So should I start using Impact Whey to top it up?

Or please give me other ways to add more protein since I’d only be consuming 25g because of 1 scoop.

This was to cut down the total calories I was consuming per shake while still getting a decent hit of protein.

Just start by taking the recommended serving size - I only cut it down because I was having bloating issues.

Guys, need some serious help.

I’m a male of 22, my height is about 5’4″, and my weight is 48kg (106lbs).

My bones seems short but I want to add muscles (but not that huge bulky bodybuilder type) to my slim body so that I can look tall & fit.

1) What would be better, SERIOUS MASS or WHEY PROTEIN?

2) The actual dosage of SERIOUS MASS is 4-8 scoops per day… what if I take 1-2 scoops per day, then will it increase my weight and muscles?

3) If i take WHEY PROTEIN 1-2 scoop what will it do?

And yes I am working out in a GYM (light weights only).

If you're going for a lean, shredded look I would avoid mass gainers altogether, as you will put on excess weight.

In your case, I would recommend a simple, low-calorie whey protein shake alongside a full-body weights routine several times per week and some high-intensity cardio (sprints, boxing, spinning, etc).

Check out our articles on training and nutrition for some more help:

I need your help to gain weight and muscles by taking Serious Mass Gain.

Someone suggested me Serious Mass Gain.

I want to know if this is effective for me or not according to my weight, height and workout I am doing everyday and food which I take.

My Age is 29, height is 5’7″ and weight is 61 KG.

I started gym 3 weeks ago with light weight.

I use normal food everyday like, breakfast, lunch and dinner with 6 eggs without yolks and bananas.

Please explain me how should I use serious Mass Gain that should give results without any side effects.

I am afraid if I will take this without knowing of exact use with exact calculation it will side effect on me.

Please help me in this so I can use this properly that will give me results.

Hi Ahmed - you should take Serious Mass between meals (not as a meal replacement) to beef up your daily protein/calorie intake.

I just started my protein diet and I wanted to get some advice.

So I’m actually 52kg for 175cm and I want to gain 6 more kilos in the coming month.

I’ve already bought the Serious Mass 12lbs and I’m taking half of the scoop in the morning and the other half after workout (5 days a week).

Do you think it will work for me or should I take 2 times the whole scoop?

Halving the measure is a good way to start if you're new to mass gainers, then once your body starts getting used to the added calories, consider upping the serving size.

Sir, I have purchased 2 packets of Serious Mass gainer 12 lbs.

I am using it for 15 days but I haven’t found any result so suggest me Sir.

How should I use it for better results before it gets completed?

My first packet is on the verge of completion but didn’t gibe any results.

Sir plz tell me which diet plan should I follow or how to use Serious Mass gainer?

Or how many scoops should I take in a day.

Firstly 15 days is far too short a time to start seeing results, and, secondly, without knowing you, I'd say that looking for answers in supplements is not going to give you the results you're after.

Start following a full-body workout routine full of compound lifts (5x5 or Golden Six ) and focus on consuming lots of protein from healthy, wholesome sources (steaks, fish, eggs, etc) before you even consider taking any supps.

Hello there, I’m wanting some help, I’m looking to gain muscle mass!

I’m about 12.5 stone right now I’ve bought mass gainer and been taking it but been getting paranoid with getting belly?

Is this normal to get belly when taking this I’m looking to gain weight and muscle mass and then shred in the summer lose as much body fat as possible.

Also got Whey Standard Gold which I’m taking now as I’ve come off mass gainer – been paranoid with my stomach!

If you could give me advice this would be much appreciated.

Yes, it's normal to develop a bit of a gut while taking mass gainers of this ilk, as this is not really a 'clean' bulk.

Just keep training hard and eating well and the excess body fat will soon come off.

To be honest I'm not really a fan of 'bulking' and 'cutting' cycles - I would always advise a more sustainable long-term plan instead.

Charlie wrote an article covering this a few years ago, you should have a read:

Do let me know if you have any more questions, and good luck with your goals!

Hey I am 17 years old and about 5’10 1/2″ and weigh around 66kg or 145 lbs.

I have been working out for a while – about 6 months – and I just bought Serious Mass to help me with my gains.

I eat a lot of fruits – an apple, a banana, an orange.

I try to get around 3,000 calories in but with Serious Mass it becomes 4,500.

The problem is I took it for the first time today.

I took one scoop just to try it out after eating rice, meatballs, potatoes and tomato sauce.

I felt like I m about to explode when I took Serious Mass haha… and when I went to the bathroom it seems like it all came out… my puss even took a bit the color of the shake.

Is this just because my stomach isn’t used to the amount of calories… because I ate all that and drank Serious Mass in about 30 mins.

How can I make the most out of Serious Mass, make my body absorb the most… should I drink it through a longer period?

Drink more water?

Take some sort of vitamins to help with the digestion of all that?

Hope you answer haha.

Thanks Nour for your very detailed comment - just what I wanted to read over breakfast haha!

In your case I would simply advise lowering the serving size and then gradually increasing it back up to the recommended 2 scoop serving.

That way your body will get used to the calorie increase and it wont be such a shock to the digestive system.

Sir I have bought 12 lbs chocolate Serious Mass.

But it hardly tastes like chocolate and is not that sweet either.

It’s really hard to mix in a shaker with water, few clumps are left at last.

I verified with customer care of ON using my lot number.

They said my product is authentic.

I’m not convinced that it’s original still

Can it be fake due to bad mixability and taste as described above?

Looking forward to your reply 🙂

As I mentioned in the review, the taste and mixability of Serious Mass is certainly not great, so it probably was authentic.

Just get it down your neck and quit complaining - the results more than make up it!

Hi Henry, I am a 17 year old who is 5 ft 11 and weigh just over 10 stone.

Your review really seemed to make me interested.

Last night I ordered this product online without reading much reviews.

Would this product work in the aspect of trying to gain just over a stone with doing my usual workout to gain muscle also or would I have to gain weight first and then turn it into muscle?

Just use it alongside your workout routine.

If you're hitting those big compound lifts (squat, deadlift, presses, rows, etc) several times per week, eating a healthy protein rich diet, and supplementing with Serious Mass, then you should definitely see results.

Feel free to get in touch any time you have any more questions :)

My age is 30, my height is 5’10”, my weight is 63kg.

Today I brought Serious mass 12lbs.

I am starting to work out from last 1 months (5 times a week), I need to gain some weight.

How much I should I take of that mass gainer protein powder after work out?

What should I do to gain mass?

Thanks & regards,

Take Serious Mass between meals (not instead of meals) to bolster daily protein and calorie intake.

Also take it after workouts for a convenient and quick hit of protein - if a regular meal is not available to you.

Regarding serving size, as I've mentioned, start with a single serving and put that up to the recommended serving when your body acclimatises to increased calorie load.

Aside from supplements/diet, make sure you are focusing on full body routines with lots of compound exercises.

I would actually say you're working out too much at five times per week.

Three solid full-body workouts every week will be much more effective, leaving your muscles more time to repair and grow.

Let me know if you have any more questions.

I just ordered serious mass 6lbs, I am 20, 6’0″ and 140lbs.

Will Serious Mass get my arms bigger and more toned while doing arm workouts such as curls and tricep pulldowns three times a week?

My name is Austin.

If you want to build muscle, forget isolation work, and focus on full body routines comprising squats, deadlifts and presses.

Hi there I’m 5ft and 48 kg and very thin.

I’ve just started in the gym twice a week one class of ladies weights and one core class.

I’m very underweight and was wondering would Serious Mass help me put on weight?

If so how would I take it and how many times a day please?

Could really do with some advice.

I know it could take months maybe years but am desperate thank you.

Hi Barbara - yes, a protein supplement will help you gain muscle mass, provided your are consistently training well and eating well.

Take it between meals to help you hit your daily protein goals (around 1 to 1.5g per pound of body weight).

Hi Henry thank you so much for your reply if you get a chance could you calculate for me how much to take.

I know you said it in your reply but I'm hopeless with mathematics.

Or how many scoops with water etc.

Sorry to be a pain.

Hey Henry, I am 17 years old, 5ft 8, and weigh 145.

I have been doing homemade weight gain shakes with organic protein, managed to put on 10 lbs in 3 months.

However I gained interest in Serious Mass but saw that it also contains creatine.

Is creatine safe for a teenager without it affecting my body in a negative way?

And do you think I will manage to put on more mass with this product than with my own weight gainer shake?

Creatine is 100% safe, I recommend it to people all the time.

And, to be honest, as great as Serious Mass is, if you're seeing results with your own homemade weight gain shakes, stick with it!

You'll save a lot of cash too!

I would like to hear your advice, I’m 5’6! and 110lbs.

I can’t gain weight, and I only eat white meat (chicken & seafoods) which makes it hard for me to gain weight.

And ‘Im a bit confused about the proper serving – I ordered 12lbs of Serious Mass.

Can I use 1 scoop (with milk & oats) in the morning (breakfast) and another one before bed time?

Because I still have ON Whey Protein so I’m planning to use it post workout.

Will that help me gain weight and muscle at the same time?

Yes, taking 2-3 protein/mass gainer shakes every day between meals will help you gain muscle mass.

Provided, of course, the rest of your diet and training regime is on point.

I am a female and I weigh 140 now I am 5’4.

I am trying to get back up to the weight I was when I was in the army which is 160.

That was the best I ever felt and looked.

I actually just purchased Serious Mass today as it is very hard for me to gain weight.

I am also starting T25… and have read that while taking Serious Mass to not do cardio is this true?

It really depends on the type and frequency of cardio.

If you want to get the best results from a mass gainer then hours of low intensity cardio are just going to be counter productive.

But sprints, compound lifts, circuits - anything that comprises short bursts of high intensity - should be fine.

I won’t go too much into detail but I go gym 3-4 times a week and looking to gain size and muscle.

I have been going for over a year and recently purchased Serious Mass, I’m taking one scoop in the morning and one at night and also one and a half after workout.

I feel I’m consuming quite a bit a day so what’s your thoughts on doing cardio and if so how much?

I like a 20 minute run etc on the treadmill on some days but in your opinion what would you feel would be the right amount to make sure I don’t get a belly!

Any help appreciated!

Too much cardio is going to be counter productive if you're taking a mass gainer.

Just focus on eating well and getting your cardio from compound lifts.

Hi, I already took 6 lbs protein and I gained 8 pounds, and recently I bought another 6 lbs Serious Mass gain to increase my weight.

Some people says if you’re consuming a supplement and doing a workout (for example biceps ) that part will consume protein and enlarge.

What if i did thigh means it will enlarge.

I don’t want to increase my thigh and butt, it may sound silly but I need to know.

When you work a muscle group in the gym, these muscles fibres will subsequently increase in size and number (your body is overcompensating to protect it from further stress), and protein intake helps this process along.

So, in a roundabout way, yes, you are right.

Hi sir, sorry if I would have a lot of questions but I would really appreciate your help!

I’m 23 years old, 5’6″ in height & weigh 49kgs, that’s embarrassing right?

I don’t know if I can still gain weight… been very skinny since birth.

I work night shift all the time bcoz I’m a call center agent so I work mostly 2am-11am or 4am-1pm.

If I buy one, how should I take Serious Mass.

It would be hard for me to take Serious Mass during short breaks coz I only have 15 mins just enough to like go to cr… hehe…

Currently I have protein shake (Promatrix 7) that offers 34g protein but 150 calories only so I feel that it would not be enough for me to gain weight if I don’t take in more calories that’s why I think Serious Mass is what I need.

Can I mix my current protein shake with Serious Mass?

Like 1 serving of Promatrix 7 mixed with 1 scoop of Serious Mass so get 34g+25g protein & 150cal+700cal?

Also I don’t go to the gym because I already feel tired due to stress from work.

Would it be OK if I just buy dumbbells so I can lift weights at home?

By using Promatrix I don’t feel like I’m gaining weight or size.

I just noticed that my muscle became harder this time bcoz I also play basketball once a week.

Would Serious Mass help me this time gaining weight?

Thank you hoping for your quick reply you can also message me on Facebook that would be great so that I could follow you as well.

Hi there, thanks for commenting.

First off, no need to be embarrassed about your weight, everyone has to start somewhere.

With hard work, you will see results, that I promise.

Mass gainers of this nature are ideal for hardgainers - just make sure you are taking it between healthy high protein meals and not replacing any meals, otherwise this defeats the purpose.

You can certainly mix this with another shake, provided, of course, you are hitting your daily calorie/protein goals.

And lastly, regarding your last question, yes, you really need to be working out while taking this, otherwise all those calories are just going to build fat and not contribute to any muscle gain.

Hope that helps a little - feel free to message me any time with any questions.

Hi Henry, your post has really helped me know more about mass gainers.

I would like to first explain my life with the weights up til now…

I started working out 1 year ago, I was quite skinny then.

After 5 months I started taking ON Whey Protein but then my friend suggested that since you require more calories you should take ON Serious Mass.

I also watched some reviews about it on YouTube and was quite satisfied.

Only one thing which scared me was that it had a gigantic scoop.

Now that I have purchased it from Amazon, many questions have arrived in my mind-

1) Can I take only one full scoop since it is just the beginning and then increase my intake after some time?

2) Major question – should it be taken with water or milk considering I want to gain muscle?

Please explain this with proper reasoning?

3) People say that bananas motivate weight gain but I am quite allergic to them, so can I avoid them completely and still gain good mass?

4) Is my decision of turning to Serious Mass from whey good?

5) How much time would it take to get results considering I go six times a week – P.S I am 18 years old!

6) Last strange question… since I have been hitting the gym I have got sulken cheeks, can mass gainers bring enough calories so that my cheeks would get puffed?

Kindly revert to it as soon as possible as your replies satisfy our queries.

Glad to know we've been of help :)

1) Yes, I would recommend precisely that.

2) Either is fine - although I would advise milk as it adds additional protein/kcals and also makes the shake taste much better.

3) Yes, that's nonsense.

4) If your goal is to gain weight, then yes, the added calories in a weight gainer will certainly help.

5) If you are consistent and work hard, you should start seeing results after a few months, but remember that great physiques are built over years, not months.

6) Yes, increased calorie intake will help with this.

Hope this helps.

I’m 20 years old and my weight is 60kg.

I started my gym 1 yrs ago and started taking the big muscle xtreme weight gainer.

After that I found the result good, then I started with the Ronnie Coleman Russian Bear, then I just left the gym for some reasons then again I started my gym 5 months ago and started taking big muscle and the major problem caused was my stomach got upset.

My digestive system has become weak, now I have been regular to gym but without any proteins & still I look skinny.

My body has been developed somewhat but my cheeks are just… I want chubby cheeks!

I want to gain some weight and muscle too but I’m confused about what products should I take?

ON Serious Mass or ON Pro Gainer or ON Whey Protein?

Sooo plzz help me, whether I take proteins or not, and if yes then which will be better for me?

In your case, if you're struggling to gain weight, I would suggest a mass gainer like Serious Mass, which is essentially a protein shake with more calories/carbs.

Just ensure you are not replacing any daily meals but rather supplementing - that is, taking Serious Mass 2-3 times a day between meals - otherwise it kinda defeats the point.

Hey, I am 23 yrs, 5’11 height, and almost 67kg two months back.

Now I am at 70 kg and no matter what I do, I am unable to gain more than this.

I hit gym 6 day per week, and I want to gain weight up to 80 kg, I am confused between mass gainer and whey protein supplement.

I have two options, Ultimate Nutrition Prostar, whey protein, and Optimum Nutrition Serious Mass.

Which one should I take?

Seems like you've hit plateau.

It means that your body has already adapted to the workout and will not grow now until you change your workout.

It is advised that you change your workout every 4-6 weeks.

Also you can go for a mass gainer if you need to gain muscle.

Six days per week is far too much - in your case less will be more.

Focus on training three times per week using full-body workouts which comprise compound movements: squat, deadlift, bench, rows, overhead press, pull-ups, dips.

This approach will improve the efficacy of your workouts while leaving your body more time to recover and repair itself between workouts.

Please ignore Rohan's advice above about changing your workout every 4-6 weeks - this is nonsense.

Find a routine that works for you and stick to it.

Regarding a protein shake, it doesn't really matter which one you choose, so long as you are hitting your macros - i.e. consuming, per day, at least 1g of protein per lb of bodyweight.

If you're struggling to get enough calories in your diet, then go for Serious Mass.

My height is 5.10 and wt is 65 kgs.

I have started gym and want to put on some wt and muscle, people hve recommended me these three supplements, which one do you suggest:

1. Anabolic halo
2. Serious mass
3. Optimum gold whey protein

I have fast metabolism as well!

I have read much about the side effects of supplements use but I’m confused regarding issues like bloating and kidney liver problems!

Whether they occur if used in excess, or taking them in prescribed way as well!

Plz tell any counter measure for these side effects.

Protein shakes are all much of a muchness, but if you're really struggling to put on weight, go for a mass gainer like Serious Mass as the added calories will help.

Regarding side effects, you should be completely fine as long as you don't supplement to excess.

Aim to consume approx 1 to 1.5 grams of protein per pound of bodyweight per day.

Hope that helps.

I’ve just changed from Gold Standard Pure Whey to Serious Mass as I’m a long distance runner and weight is falling off me at the moment.

No matter how much lean food I eat along with two servings of Gold Standard Whey I just keep loosing weight!

Do you recommend Serious Mass to help me keep weight on or switching back to whey?

P.S I still go the the gym once a week to do core exercises and weights but I’m clocking up over 20 miles a week running.

To be honest, if you're that worried about losing weight, stop distance running.

Running marathons and building muscle mass are completely at odds.

I am 28+, 5.7″, 56 kgs.

Aiming to add muscles, athletic.

Hitting Gym almost 6 days/week.

Medium to intense workouts, doing weight training and leg workouts as well.

My Questions are:

1. I have been taking only 1 scoop which I realized is just 1/2 serving. Was it all wasteful all along for me. (Gained 1.5 kgs since last 1 month).

2. Is taking 1 scoop before workout an ideal one to do (I’m a lean body) along with post workout 1 scoop?

3. What instruction should I follow in consuming Protein Shakes when taking temporary breaks 2 months in exercising or long breaks like 6 months?

Will highly appreciate the advice.

Thanks in advance!

Six days per week is far too much - recovery is equally important to muscle growth as diet and training.

If your goal is to bulk up, you'd be better off with a full-body routine, in which you'd train every bodypart three times per week using compound lifts, and leave four days for your muscles to repair and grow.

Regarding your other question, such minutae is unimportant - instead focus on how much protein you're consuming on a daily basis (your goal should be around 1 to 1.5 grams per pound of bodyweight per day).

Sir, I am going to buy SERIOUS MASS from Amazon.

But as the product is non-returnable, how would I identify that it’s a fake or original?

And if I got the fake one how should I return it??

And how many scoops are there in a tub of 6.6lb?

I had joined gym just before 2 months, so is it OK to me to start having supplements?

And as I am beginner how many scoops should I consume a day and on what time should I consume it?

I highly doubt Amazon are going to be stocking counterfeit Serious Mass.

Regarding your other questions:

1) Not exactly sure, but a large back of Serious Mass will last about a month if I remember correctly (been a while since I took it).

2) Yes, you'll be fine, just remember not to take supplements at the expense of "real" food, and don't expect them to work magic.

3) For starters, I would recommend taking 1 scoop twice a day between meals, and then increase intake from there if required.

Hi Henry: am a 38 yr old female.

Have been 68kg for over 6 years and exercise mainly spinning, squats, lunges, and light arm weight lifts.

In past 5 months I have come from 68kg to 64kg (approx).

Before losing this weight, I had a curvy butt and hips to die for.

Since I’ve gone down to 64kg, my butt has shrunk along with my thighs.

My diet hasn’t changed, so not sure why the sudden weight loss.

Question: Can I still use Serious Mass and my normal routine and gain my butt muscle back?

In what way can I combine exercise and Serious Mass to achieve this?

Note: My butt looks smaller, but toned.

I like it prominent and lifted.

Not sure if my exercise routine + Serious Mass will help me achieve this.

Please help me sort my body out before i start eating rubbish to gain unnecessary weight

"My diet hasn’t changed, so not sure why the sudden weight loss."

Because your body is burning more calories, and with it body fat, from the increased exercise.

If you're unhappy with these changes, that's your call at the end of the day, just stop exercising.

This is an effective mass gainer but the problem I have with this is it has a very low protein to carb ratio, which is likely to add lots of fat to your body.

I used it, and liked the whole process of gaining weight through it, but I had to go through hell to burn the fat that I gained with it in my chest and abdomen.

Can’t consider it the best weight gainer.

Exactly, the ratio kinda sucks.

Could anyone help me out how can I fix that ratio?

I have been recommended to use the Mutant Mass weight gainer which has a somewhat better ratio of carb:protein.

Though I am using serious mass for three months and have seen results, I'm kinda confused.

Virtually all mass gainers will yield some fat gain, it's the nature of the beast, you just have to counteract this as much as possible by working your arse off in the weightroom and eating a healthy, nutritious diet.

There is no magic solution out there that will give you massive lean muscle mass overnight.

Besides Serious Mass, if you want to look at what else there is on the market in terms of mass gainers, and what we recommend, check out our article on the 'Best Mass Gainer Supplements '.

I am also planning to use ON SM 5.4 kilos supplement, but the things is, I am the endomorph type, I weigh 79 kilos and I am 180 cm tall.

Do you recommend using Serious Mass for me, bearing in mind that I gain fats easily?

Please bro I need some solid pieces of advice and if you don’t mind suggesting for me the type of foods I should be consuming while using SM.

And please do not forget to tell me how many scoops should I consume per day because Serious Mass’s scoop is soooo big ._.

If you're an endomorph I would refrain from taking a mass gainer - you simply won't need those extra calories, and a lot of it's going to end up as fat.

If your goal is to increase muscle mass, just focus on getting around 1-1.5g of protein per lb of bodyweight per day, from regular meals if possible, but supplementing with a regular low-carb whey protein shake if required.

Nutrition-wise, I would recommend the macro-counting plan in Jim Stoppani's 'Shortcut to Shred' programme, which I've personally found to be effective (don't worry too much about all the supplement recommendations):

And, of course, make sure your gym routine is built around heavy, compound lifts to really maximise muscle growth.

I am in need of advice.

I know it’s kind of tiring to keep on replying the same questions over and over again, but could you please answer my question?

First and foremost, I am already training for one year without supplementing my diet and through the process of training, I achieved great results.

However, I am thinking about adding more weight asap.

So I have been reading article for 3 days about what product is the best when it comes to bulking, and the answer of most of the bloggers was ON Serious Mass.

I already ordered one, but the thing is, I am confused what training routine should I stick to in order to gain weight and muscle fast.

Should I stick to the Stronglifts 5×5 routine or what?

I don’t want to gain fats, so it would be also nice of you to suggest how many scoops I should consume on a daily basis.

Please answer my inquiry.

Thanks for creating this thread in the first place so that we can get our questions answered.

Regarding a routine, anything that has you working the full-body three times per week, using heaving compound lifts, is going to yield results.

I'm a huge advocate of the 5x5 protocol, having used the Stronglifts and Madcow programmes as well as Reg Park's original 5x5 routines, time and time again to great effect.

So, I would advise sticking with your routine, and just keep adding weight to that bar!

Regarding scoops, I would suggest taking one per serving at first, and then work up to two, seeing how you go.

Good luck - and let me know if you have any further questions!

I read your article and most of your comments, it’s really helpful.

I am 25 year old boy, I have 48 kg weight, now.

I was going out for gym from so many months, I have taken Dynamite Super Mass Gainer before 4 month ago, it gain my weight by 4kg in 3 months, but then I was unable for going out for gym for 1 month and it takes my weight again to 48 kg.

Then after I was taking Optimum Nutrition Serious Mass gainer for last 1 month after workout, daily one scoop with milk, but my weight still there.

I read your comments and got some answer of questions like I have to take twice in day but still can you give me some advice bro?

It will really helpful to me, thanx in advance bro.

The best advice I can give is to just keep at it - you'll get results by being consistent over months and years, not weeks.

Focus on full-body workouts with compound lifts in the gym, eat lots of wholesome high-protein food and supplement with Serious Mass between meals, get as much sleep and rest as you can, and drink lots of water.