Protein Powder, Ready-to-Drink and Bars Compared

Protein is sold as powder, as ready-to-drink shakes, as bars and increasingly as gummies and chews. They differ in protein per serving, in what else comes with it, and by a wide margin in cost per gram of protein.

Powder

The reference format. Typically 20–25 g of protein per scoop, the lowest cost per gram, and the one where the panel is simplest — protein, a little carbohydrate and fat, flavouring. Requires mixing, and scoop sizes differ between brands, which is the main trap when comparing tubs. See working out cost per serving.

Ready-to-drink shakes

Convenience at a premium. Protein per bottle is usually comparable to a powder serving, so the comparison is straightforward — and the cost per gram is typically several times higher. The other difference is the ingredient list: an RTD needs stabilisers, emulsifiers and preservatives to be shelf-stable, where a powder does not.

Bars

Bars are a food product with protein in them, and the panel reflects that. Alongside the protein there is usually a meaningful amount of carbohydrate, fat and often sugar alcohols, and the calorie figure per bar is much higher than a scoop of powder mixed with water.

If you are comparing a bar with a shake on protein alone, you are missing most of what is on the panel. Read protein, calories, sugars and sugar alcohols together — the last of these being the common cause of digestive complaints about protein bars.

Gummies and chews

The newest format and the one where the gap is widest. Fitting 20 g of protein into gummies is not practical, so these products carry a small fraction of a powder serving. They are a snack with some protein rather than a protein serving.

Clear or fruit-flavoured isolates

Whey isolate formulated to mix clear rather than milky. Nutritionally these compare directly with other isolates — read protein per scoop against scoop size as usual. See isolate vs concentrate.

The single comparison that works across all of them

Cost per gram of protein, calculated as: price ÷ servings per container ÷ grams of protein per serving. Run it across a tub, a case of shakes and a box of bars and the spread is usually much larger than people expect.

That does not make the expensive formats wrong. A shake in a bag is a serving you actually consume; a tub at home when you are out is not. But it should be a decision made with the number visible.

Third-party testing

Certification — Informed Sport, NSF Certified for Sport — is more common in this category than most, and it matters particularly for anyone subject to drug testing. Where a manufacturer states a certification we record it as their claim; we have not verified it. See how we review products.

Dietary suitability

Whey is a dairy product and is not vegan — see is whey protein suitable for vegetarians and whey vs plant protein. Format does not change this; a whey bar is still dairy.

Our whey protein comparison and vegan protein comparison filter by brand, pack size and servings per container.

References

• NIH Office of Dietary Supplements — Dietary Supplements for Exercise and Athletic Performance
• NSF Certified for Sport