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Brown Rice Protein
A hypoallergenic plant protein with one good resistance-training trial showing body-composition and strength gains comparable to whey when dosed high — naturally lower in lysine, so often blended with pea.
What the evidence says
Most Rice Protein studies are mechanism or observational rather than RCTs that measure a clinical effect — keep findings provisional.
Most evidence is from medium-quality randomised trials published 2013–2025 with a typical study size of 24 participants.
Based on 3 studies · 1 RCT · 24 total participants
Confidence
LowBy outcome
Rice Protein has an evidence score of 3.5/10 — emerging evidence based on 3 indexed studies. A hypoallergenic plant protein with one good resistance-training trial showing body-composition and strength gains comparable to whey when dosed high — naturally lower in lysine, so often blended with pea. Representative study: PMID 23782948.
The commonly studied dose of Rice Protein is 30-48g per serving (the muscle RCT used 48g; dose high because leucine density is lower). Individual needs vary — start at the lower end of the range and adjust based on how you respond.
Explore: Best supplements for Athletic Performance
Last reviewed June 2026 · evidence from 3 studies · how we score
This information is for educational purposes only. It is not a substitute for professional medical advice. Always consult a qualified healthcare provider before starting, stopping, or changing any supplement or medication.
Rice protein (typically from brown rice, Oryza sativa) is a vegan, hypoallergenic protein isolate. Its standout evidence is a single well-known 8-week RCT (Joy 2013) in resistance-trained men: when dosed high (48g post-workout), rice protein isolate produced increases in lean body mass, strength, and power that were comparable to an equal dose of whey isolate. That's a genuinely encouraging finding, but it rests largely on that one trial — the body of evidence is thinner than soy's. Rice protein is a relatively complete protein but is naturally limited in lysine (and somewhat lower in total essential amino acids than animal proteins), which is why it's frequently blended with pea protein, whose high lysine complements it. Dose adequately: rice protein's lower leucine density means larger servings are needed to match whey's anabolic signal.
Delivers essential amino acids that stimulate muscle protein synthesis when dosed adequately.
Naturally lower in lysine; pairing with pea protein completes the profile.
How Rice Protein works — from molecular targets to health outcomes. Click an edge to see supporting research.This visualization is in beta — pathways are being refined and expanded.
30-48g per serving (the muscle RCT used 48g; dose high because leucine density is lower)
Can be taken without food
| Form | Type |
|---|---|
| 💊Brown rice protein isolate (often blended with pea protein) | Recommended |
| 💊Rice+pea blend | Alternative |
Pairing with pea protein adds lysine and completes the amino-acid profile.
Minimum: 4 weeks
Optimal: 8 weeks
Cycling: Not required
Note: Total daily protein matters most; a generous dose around workouts helps.
Dose-response data unavailable. The current published research for Rice Protein does not provide sufficient dose-specific outcome data to generate reliable dose-response curves.
Refer to the Dosage & Timing section above for recommended dose ranges based on available evidence.
Supported strength, power, and lean-mass gains comparable to whey when dosed high.
Provides post-exercise amino acids to support recovery.
Dairy-, soy- and legume-free protein suited to those with allergies.
Discuss total protein intake with your clinician.
Generally fine as a food protein.
No notable drug interactions; very high protein intakes warrant caution in kidney disease.
Tip: Reduce serving; split doses
Pea's high lysine complements rice's limiting amino acid, creating a complete plant-protein blend.
A complete vegan amino-acid profile rivaling animal protein.
Protein + creatine is a well-established muscle-building combination.
Enhanced muscle and strength gains.
Timing is flexible for Rice Protein — consistent daily use matters more than the time of day. Total daily protein matters most; the supporting trial dosed 48g post-workout.
Rice Protein is generally well-tolerated and considered safe for most healthy adults at recommended doses. The most commonly reported side effects are bloating/GI upset. Use caution if any of these apply to you: None significant.
Leucine, isoleucine, and valine metabolized directly in muscle tissue — support protein synthesis and reduce exercise fatigue.
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