Gaspari Nutrition SizeOn Maximum Performance Review

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Where to Buy SizeOn

SizeOn Overview

SizeOn Maximum Performance is Gaspari Nutrition’s high-grade intra-workout supplement. Designed to be taken during your workout, this comprehensive stack combines whey protein, branched chain amino acids, carbs, creatine, electrolytes and a proprietary SizeOn Blend. The benefits of this stack include

  • Increased power and strength
  • Sustained energy from a carb matrix
  • Gains in muscle mass and volume

There are four tasty flavors available as of 2017:

  • Wild Berry Punch
  • Orange Cooler
  • Grape Cooler
  • Arctic Lemon Ice

SizeOn Maximum Performance comes in a 3.49-pound jug/bottle that yields close to a month of one-scoop servings. As with other Gaspari Nutrition products, this product is a revamped second-generation version of a previous product that had a similar name.

The newest formula reflects advances in clinical research and sports nutrition. It’s good news for amateur lifters and seasoned warriors. For juniors, this product brings renewed energy, focus and drive so you can endure challenging gym sessions full of sets and increasing poundages.

For seasoned muscle enthusiasts, this product complements your highly developed stamina and strength, allowing you to burst through plateaus and shake up workouts with new, more grueling strategies, such as pyramiding, drop sets and negative reps.

What’s in SizeOn Maximum Performance?

A proprietary SizeOn Blend is the workhorse complex of ingredients that Sizeon Maximum Performance contains. This blend is essentially creatine, carbs and protein. The foundation for this blend is a decent array of vitamins and minerals, such as vitamin C, five vitamins from B-complex, calcium, magnesium, phosphorus and sodium.

The C and B vitamins help your body to manage the “stress” that lifting places on your body, boosting your immune system, nervous system, circulation and energy production. Vitamin C is also a powerful antioxidant, neutralizing free radicals and the damage they cause.

The four minerals in this product provide some electrolyte support, enabling muscle contractions and mental clarity while minimizing the risk of cramps.

The remainder of the ingredients in this product make up the SizeOn Blend, which amounts to 63 grams of compounds and nutrients. The blend consists of two matrices and two complexes.

Carbohydrate Energy Matrix

This matrix includes several sugars, such as dextrose and trehalose. Dextrose is a form of glucose, one of the simplest, basic sugars that your body utilizes immediately after it enters your bloodstream.

Trehalose, naturally present in foods like shrimp, mushrooms and lobsters, is another simple sugar consisting of two small glucose molecules. Although trehalose is a simple sugar, it is a slow-digest carb. Trehalase, the enzyme required to break down trehalose, exists in the human body, but it works very slowly on trehalose.

Consequently, trehalose takes longer to impact blood sugar, supplying a steadier and more gradual stream of simple energy during your workout. This keeps your energy at an even keel and prevents the dreaded experience of crashing.

Protein Synthesis Acceleration Matrix

Whey protein hydrolysate and the BCAAs l-leucine, l-isoleucine and l-valine constitute this matrix. Recall that BCAAs are essential amino acids, which means you’re body requires them but can only obtain them from external sources. In your body, BCAAs stimulate the synthesis of new protein (muscle).

The combination of BCAAs and whey protein furnish your body with the necessary tools to promptly begin rebuilding the muscle you’re breaking down so as to maximize your gains. This matrix also ensures that your body does not enter a catabolic state, which is always a danger during hardcore lifting.

Catabolism is the breakdown of muscle for energy, a regrettable outcome of working out for extended periods at high intensity without sufficient carb energy in your blood, muscle glycogen and or available protein.

PhosphoDrive Endurance Complex

This complex features an assortment of creatine supplements, such as creatine monohydrate as Creapure, magnesium creatine chelate as Creatine MagnaPower, and disodium creatine phosphate.

Each form of creatine offers the same benefit to your body. Creatine is the basic energy your body uses for muscle contraction. Creatine also ushers extra water (electrolytes) into your muscles, giving them a fuller, more beefy look.

Creapure and Creatine MagnaPower are trademark forms of creatine by AlzChem and Albion Human Nutrition respectively. Both are highly respected manufacturers of sports nutrition ingredients in the business-to-business sports nutrition market. Creapure is micronized, while Creatine MagnaPower is creatine and chelated magnesium.

Each has superior loading affects, saturating muscle with creatine more efficiently and quickly.

Osmodrive Advanced Hydration Complex

This complex helps your body to replenish, rehydrate and recover. A mixture of glutamine, taurine, magnesium, calcium and potassium, this complex flushes lactic acid out of sore muscle and stimulates the rebuilding of muscle and tissue. It helps you to bounce back more swiftly between workouts, to workout more often and improve the rate at which you gain lean mass.

Gaspari Nutrition SizeOn Maximum Performance supplement facts label


Clinical research and studies confirm the efficacy of the high quality ingredients in SizeOn Maximum Performance. As with any supplement, consistent dosing over a period yields the most noticeable results. Depending on genetics, diet, level of experience and your workout regimen, your results while using SizeOn Maximum Performance might different from some other guy’s results.

Gaspari Nutriton enjoys an industry-wide reputation for producing powerful, pure, effective products praised among the professional and amateur set. Customer reviews of this product in major online bodybuilding forums and on international e-commerce websites continuously attests to how well this product works.

Overall Quality

SizeOn Maximum Performance has the content and power of an elite, boutique supplement, yet Gaspari Nutrition gears it at any lifter seeking to go to the next level. It is the ultimate balance between premium material at an accessible price point. The overall quality scores high marks on a scale of one to 10.

Pros and Cons


  • Contains the most refined, active ingredients available on the market
  • Backed by clinical research, assays and studies
  • Fast-acting
  • Jug/bottle supplies a month of servings
  • Convenient one-scoop serving
  • Extensive array supplies vitamins, minerals, protein, creatine and carbs
  • Contains no stimulants
  • Okay to take before evening workouts
  • Okay to take year-round without any need for cycling
  • Stackable with other supps, such as CLA, BCAAs, etc.


  • Fairly Pricey


The taste of SizeOn Maximum Performance varies from flavor to flavor. Users tend to favor the arctic lemon ice and wild berry punch, with the latter having the most positive votes on most forums and e-commerce websites.

All of the flavors are at least palatable, and even the grape and orange flavors have their own dedicated followers. Discovering your favorite flavor is part of the fun in trying new products. At roughly $1.80 per serving, this product is affordable enough for you to try all four flavors over a few months.

SizeOn Maximum Performance mixes easily and thoroughly with fluid. Engineered to dissolve in water, this product has an anti-caking agent that prevents it from clumping inside the bottle and when introduced to water. When mixed with water, there is no residue or powdery texture.

Value For Money

At roughly $47 for a 3.49-pound bottle that provides about one month of servings, SizeOn Maximum Performance is a good value for your money. You should also consider that this product combines a host of select, quality ingredients that would break the bank if you purchased them separately. Furthermore, the various complexes contain sufficient amounts to substitute for other supplements you might be taking.

For example, the creatine complex in SizeOne Maximum Performance is more than enough to saturate your muscles and increase your lifting power. In that sense, this product is many products rolled into one for less than 25 percent the cost of all the same products combined: an excellent value.

Final Verdict

Gaspari Nutrition’s SizeOn Maximum Performance trumps other intra-workout supplements by far. Its complexes and matrices bursting with premium ingredients backed by research make this a valuable, powerful, must-have supplement for your current cocktail.