Dymatize ISO100 Whey Isolate vs Optimum Nutrition Gold Standard Pro Gainer

ISO100 is the pick when you want protein and not much else cluttering the label. Each serving delivers 25g of protein alongside 5.5g of BCAAs, including 2.7g of L-Leucine, while keeping things tight at 1g fat, 1g sugar, and under 120 calories, numbers that are hard to match once you start comparing tubs side by side.

It is filtered to cut excess lactose and carbs, and the protein itself is broken down into small peptides for faster absorption, exactly why people reach for it right after a workout rather than saving it for later in the day. Dymatize publishes third-party Informed-Choice testing on ISO100, which is the check that matters for anyone who gets drug tested.

The tradeoffs are the ones you would expect from a premium isolate. It carries a premium price per tub, and being whey-based, it is not an option if you are following a plant-based diet. For anyone watching macros closely, it is about as clean as protein powder gets.

Pro Gainer is built for one job: helping you eat more without choking down extra meals throughout the day. Each serving stacks 650 calories, 60g of protein, and more than 80g of carbs, which is the kind of math that actually moves the scale for someone who struggles to eat in a surplus.

It comes from Optimum Nutrition's Gold Standard line, so the brand pedigree behind the formula is well established, and for a genuine hard gainer, someone who trains hard but cannot out-eat their metabolism, this solves a real problem that whole food alone often does not.

Be clear-eyed about who this is for, though. This is not a powder for someone trying to lean out, the calories and carbs are the entire point, not a side effect, so using it while cutting works directly against your goal. It also carries the highest price of the three picks here. For skinny lifters trying to bulk, it does exactly what it promises.