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Protein powders (whey, casein, plant blends)

What Protein powders (whey, casein, plant blends) is, what the NIH ODS fact sheet says the evidence supports, typical doses, timing, and the cautions that come with it.

Supplements are not medicines and this page is not medical advice. Doses that help one person can harm another — with medicines, kidney or liver conditions, pregnancy, or before surgery, talk to a clinician before starting anything. More is not better.

What it is

Concentrated milk or plant protein, mostly used for convenience or training.

What the evidence supports

ODS (exercise performance fact sheet): protein supplementation helps muscle gain when combined with training and when total intake is otherwise low; it is food, not a medicine.

Dose and timing

No RDA specific to powders; total protein reference intake for adults is 0.8 g per kg of body weight per day, more for athletes (commonly 1.2-2.0 g/kg). Any time; around training is conventional but total daily intake is what matters.

Cautions

Extra protein beyond need is simply calories.

Interactions are the hidden risk: supplements can change how medicines work and vice versa. Give your clinician the full list before anything else.

Source: NIH Office of Dietary Supplements — Protein powders (whey, casein, plant blends) fact sheet · checked 2026-09-03

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