Optimum Nutrition Serious Mass vs BSN True Mass

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Andy Williams
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Optimum Nutrition Serious Mass vs BSN True Mass: Which is better for building muscle and gaining weight? That’s the topic of today’s comparison.

As I said on our BSN True Mass reviews page, there are actually two types of True Mass. You have the regular True Mass, which has 620 calories, and then True Mass 1200, which has 1231 calories per serving.

Since True Mass 1200 is better than the regular True Mass (no soy protein) and more similar to Serious Mass, that’s the supplement I’ll be using for this comparison.

So when I say True Mass, I’m specifically referring to True Mass 1200.

With that said, let’s check out the ON Serious Mass results and my findings about BSN True Mass to see which supplement comes out on top.

Optimum Nutrition Serious Mass vs BSN True Mass: The Differences

A comparison of Serious Mass vs BSN True Mass 1200

As you’re about to find out, Serious Mass and True Mass are very similar supplements. You can really understand why people want to find the differences between them!

Serious Mass has slightly more calories and carbs than True Mass, but it also has a larger serving size.

On the other hand, True Mass has a couple of grams of extra protein and a bit more fat, giving it more balanced macros.

True Mass is also lower in sugar than Serious Mass (20g vs 26g), but the difference is trivial and barely worth noting.

Perhaps the biggest nutritional difference is that True Mass is creatine-free, whereas Serious Mass has 3 grams of creatine per serving. Personally, I like to take my creatine separately so that I can ensure it’s coming from a top-quality source. Plus, I like to cover my bases by taking 5 grams rather than 3 grams.

True Mass also has a wider variety of protein sources than Serious Mass, which may give you a broader range of essential amino acids. However, the end result in muscle growth is unlikely to differ because Serious Mass contains plenty of quality protein of its own.

BSN True Mass vs Optimum Nutrition Serious Mass: Taste and Mixing

The scoops from BSN True Mass and Optimum Nutrition Serious Mass

This is naturally the most subjective part of our whole True Mass vs Serious Mass comparison because opinions on supplement flavours are bound to differ.

So, for what it’s worth, here’s my opinion.

True Mass tastes better (more authentically chocolatey) than Serious Mass, but it’s also a bit more filling. While Serious Mass was certainly drinkable, I enjoyed my True Mass 1200 shakes more because they tasted more like milkshakes than chalky mass gainers.

Mixability was about the same, which isn’t surprising because both True Mass and Serious Mass have very similar amounts of calories. To mix either True Mass or Serious Mass, you’ll need an electric blender because mixing 300+ grams of thick mass gainer powder just isn’t possible in a standard shaker bottle.

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Optimum Nutrition Serious Mass: Ingredient Quality and Effectiveness

Back view of Serious Mass and True Mass

The main ingredient difference between BSN True Mass and Optimum Nutrition Serious Mass lies in the protein sources.

While Serious Mass has a simple blend of whey concentrate and calcium caseinate, True Mass has those same proteins but also includes micellar casein, milk protein isolate, and egg albumen.

It certainly doesn’t hurt to have a wider variety of proteins as long as they come from quality sources, but I’m not convinced that there’s a massive benefit, either.

What I look for the most is a combination of quick-release and slow-digesting protein so that my muscles can stay in an anabolic state for longer. And since both True Mass and Serious Mass meet this requirement, there’s very little to separate them in terms of protein quality.

As I said earlier in this Serius Mass vs True Mass comparison, the reason why I’m using True Mass 1200 for this comparison is because the regular True Mass uses soy protein, which isn’t widely considered a quality protein source in the bodybuilding community.

While Serious Mass does have more calories and carbs than True Mass 1200, I don’t think the difference is big enough for me to say that it’s more effective.

Specifically, True Mass 1200 has 1231 calories, 210g of carbs, and 52g of protein, whereas Serious Mass has 1263 calories, 251g of carbs, and 50g of protein.

True Mass 1200 vs Serious Mass: Value For Money

A side by side comparison of BSN True Mass 1200 vs Serious Mass

A big bag of True Mass 1200 has 15 servings, whereas a large bag of Serious Mass has 16 servings. However, because True Mass is a bit cheaper than Serious Mass, you could actually say that True Mass is better value for money.

Honestly, though, the price and nutritional differences are so small, that it’s virtually impossible to pick an outright winner based on any kind of objective criteria.

This is why I recommend, if funds allow, to buy a tub/bag of both Serious Mass and True Mass so that you can compare them for yourself and see which one you like the best. Then, once you’ve picked your favourite, you can make that your go-to weight gainer from then on.

Or, you could use both long-term—switching between them to change things up and trying different flavours as you please over the course of your bulk.

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The Verdict: Should You Buy True Mass or Serious Mass?

Overhead image showing the differences between BSN True Mass and Optimum Nutrition Serious Mass

As I’ve maintained throughout this Optimum Nutrition Serious Mass vs BSN True Mass comparison, these two supplements are almost impossible to separate, but I’ve tried my best to highlight the differences, as small as they are.

Serious Mass has more carbs and calories than True Mass, while True Mass has more protein and fats than Serious Mass.

True Mass has more varied protein sources than Serious Mass, which may result in a wider range of essential amino acids.

I also thought that True Mass was taster than Serious Mass, but taste is very subjective, so you might have a different experience.

Ultimately, you can make great gains with either supplement, so I just recommend going with whichever one takes your fancy.

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Andy Williams
Andy Williams is a UK-based personal trainer and bodybuilder who coaches gym-goers of all levels using proven evidence-based techniques in strength training, nutrition, and supplementation. He’s tested over 70 different mass gainers for their ingredient quality and muscle-building effectiveness and regularly shares his findings in his mass gainer reviews.
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