Supplement analysis backed by scientific evidence · PT

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Limited evidencePhysical performance

Rice Protein

A single small 8-week trial suggests a large 48 g dose of rice protein isolate matches whey for body composition and strength - and that trial is essentially the whole direct evidence base. It works as a protein source, but the specific evidence is thin.

What the science says

  • Matched whey at a high dose over 8 weeks Limited evidence

    In 24 resistance-trained college-aged participants, 48 g of rice or whey protein isolate taken post-workout during 8 weeks of periodized training produced comparable improvements in lean body mass, strength and power, with no significant between-group differences. There was no placebo arm, the sample was small, and the study involved supplement-industry authors.

  • Plant protein is roughly equivalent to animal protein overall Moderate evidence

    A meta-analysis of 16 RCTs found no effect of protein source on absolute lean mass or muscle strength, with a small advantage for animal protein on percent lean mass and in adults under 50 (+0.41 kg lean mass). This indirect evidence is what most of rice protein's credibility rests on.

  • Lysine is the limiting amino acid Moderate evidence

    Rice protein is low in lysine and lower in leucine than whey, which is exactly why the successful trial used a 48 g dose rather than the usual 25 g. Blending rice with pea protein produces a more complete amino acid profile at lower total doses.

Dosage & safety

Studied dose40-50 g per serving if rice protein is the sole source, mirroring the only training RCT. In rice-pea blends, 25-30 g per serving is adequate.
SafetyHypoallergenic and free of dairy and soy, which is its main practical appeal. The real concern is inorganic arsenic: rice concentrates arsenic from soil, and rice protein powders have tested high in independent analyses. Rotate protein sources and prefer brands publishing heavy-metal testing, and be more cautious with daily high-dose use in children and pregnancy. GI tolerance is otherwise good.

Scientific references

Where to buy

NutriBiotic, Organic Rice Protein Powder, Plain, 1 lb 5.16 oz (600 g)

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