Is protein powder worth it, and which type should you get?

The evidence-led answer

NST verdict

Protein powder is a convenience, not a requirement. Across the research, supplementing protein adds only a small amount to what resistance training already does, and that small amount essentially vanishes once your total daily protein is high enough from food. So the honest answer to "do I need it" is: only if you are struggling to hit your protein target otherwise, in which case a 25 to 30 gram scoop is a cheap, fast way to close the gap. On type: for building muscle it barely matters which you pick once protein per serving is matched. Whey concentrate is the low cost default; whey isolate has more protein and less lactose per scoop if dairy bothers you; plant powders are a fine choice if they are soy based or a pea and rice blend, which the evidence puts level with whey for strength and only slightly behind for muscle mass. Single source rice or oat protein is the weakest pick.

Do you actually need protein powder?

Probably not, strictly. A pooled analysis of 49 randomised trials found that adding a protein supplement to resistance training increased one rep max strength by about 2.5 kg and fat free mass by about 0.3 kg on average, and that the fat free mass benefit stopped once total protein intake reached roughly 1.6 g per kg of body weight per day, with a wide confidence range. Once you are eating enough protein, more from a tub does very little. Where a powder earns its place is convenience: targets for people who train are around 1.4 to 2.0 g/kg/day, and if you routinely fall short a scoop is a fast, cheap 25 grams of protein. Treat whole food as the default and the powder as the top up.

Whey: concentrate, isolate or hydrolysate?

All three are whey; they differ in how much they are filtered. Concentrate is least processed, so a bit less protein per 100 g and some lactose, carbs and fat, but the cheapest per gram of protein and fine for most people. Isolate is filtered further: more protein per scoop, very little lactose, carbs or fat, at a higher price, worth it mainly if dairy upsets your stomach or you want the leanest macros. Hydrolysate is partly pre digested, the most expensive, with no clear extra muscle building benefit. For building muscle the differences wash out once you match protein per serving, so pick on price, lactose and taste.

Is plant protein as good as whey?

Close, and for some outcomes identical. A 2025 pooled analysis of 43 randomised trials found plant protein produced slightly smaller muscle mass gains than animal protein overall, a small effect size of minus 0.20, with no difference for strength or physical performance, and no difference at all between soy and milk protein for muscle mass. The gap came from single source non soy plant proteins such as rice, oat and potato, and from whole plant based diets, not from soy or well formulated blends. So a plant powder is a solid choice if it is soy based or a multi source blend such as pea plus rice, with roughly 20 to 30 grams of protein and a good dose of leucine per serving. A single source brown rice or oat protein is the weakest option for muscle.

Is it safe? Kidneys and dairy

In healthy adults, higher protein diets, including protein from powder, do not harm measured kidney function; if you have existing kidney disease, follow your doctor's advice. On digestion, concentrate has some lactose, isolate has very little, and plant proteins have none, so if whey concentrate gives you bloating or wind, switch to isolate or a plant powder.

How to read a protein powder label

Four things matter. Protein per serving: aim for roughly 20 to 30 grams in a sensible scoop size. Ingredient list: short is good, and be wary of proprietary blends that hide amounts. Added sugar: low, because flavour should not cost you 10 grams of sugar a scoop. Third party testing: an Informed Sport or NSF logo matters if you are drug tested or want contamination assurance, and is optional otherwise. Flavour and mixability are pure preference and not something NST can judge for you.

Products we are evaluating for this guide

Review pending, not recommendations. The products below are named so this guide can point to more than one option per type once they have been checked. NST has not tested them, has not verified their formulas, and has recorded no price, rating, ranking or affiliate link. A named reviewer completes the checklist in the product review brief, exact formula, protein per serving, third party testing, availability, then a checked dated price note and, only if approved, a disclosed affiliate link, before any of this becomes a recommendation. Whey blend candidate: Optimum Nutrition Gold Standard 100% Whey. Whey concentrate candidate: Bulk Pure Whey Protein. Whey isolate candidate: Myprotein Impact Whey Isolate. Plant soy isolate candidate: Myprotein Soy Protein Isolate. Plant blend candidate: Bulk Vegan Protein Powder, pea and brown rice.

What this means in practice

Work out your daily protein target from the protein article. If you hit it from food most days, you do not need powder. If you keep falling short, one scoop a day of the cheapest option that agrees with your stomach will close the gap for very little money. Choose whey concentrate for value, whey isolate if dairy is a problem, or a soy or pea and rice plant powder if you avoid dairy; all build muscle when protein per serving is matched. Look for about 20 to 30 grams of protein per serving, low added sugar, and a third party testing logo if you compete.

Limitations and uncertainty

The plant versus animal pooled analysis pools mixed ages and a lot of older adults; the strength "no difference" is solid, the muscle mass gap is small, and it is not specific to young trained lifters. No pooled analysis directly compares whey concentrate, isolate and hydrolysate for muscle growth at matched protein; that comparison here is composition plus reasoned equivalence. The Morton breakpoint of about 1.6 g/kg/day has a wide confidence range. NST has verified none of the candidate products; every product detail is a reviewer task. This is about muscle and strength, not weight loss, general health, or performance in a specific sport.

What would change our conclusion

A pooled analysis in trained younger adults showing a clear muscle or strength gap between well formulated plant blends and whey. Head to head trials showing concentrate, isolate or hydrolysate differ for hypertrophy at matched protein. Or new evidence on long term high supplement protein intake in healthy adults.

How NST assessed this

NST ran no nutrition studies and tested no powders. This article is built from published research: a 49 trial pooled analysis of protein supplementation and resistance training, a 43 trial pooled analysis of plant versus animal protein for muscle, the ISSN protein and exercise position stand, a narrative review on protein distribution, and a pooled analysis of protein intake and kidney function. Bibliographic details were checked against PubMed in September 2026. Each claim is tied to a named source, and the evidence records and every product detail still need a human editor to finalise.