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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 high-quality randomised trials published 1984–2026 with a typical study size of 24 participants.
Based on 10 studies · 6 RCTs · 24 total participants
Confidence
Moderate confidenceBy outcome
Scored Emerging (4.5) because a single 8-week RCT shows high-dose rice protein produces muscle and strength gains comparable to whey, but the evidence base is thin and rests largely on that one trial.
35 trials ongoing or recruiting · 111 completed on ClinicalTrials.gov
5 of the completed trials have posted results
Registered trials show research momentum for Rice Protein, not proof of effect — a registration is a plan, and posted results are sponsor-reported, not peer-reviewed. They are never counted toward the evidence rating above.
Browse these trials on ClinicalTrials.govClinicalTrials.gov · as of Sep 2026
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.
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. This possible interaction has not been individually evaluated for this supplement; its likelihood and severity are unknown. If you take an anticoagulant or antiplatelet medicine, ask a pharmacist or prescriber before using this product. Do not stop or change prescribed medicines based on this notice.
Tip: Reduce serving; split doses
Rice Protein has an evidence score of 4.5/10 — emerging evidence based on 10 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.
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. Reported side effects are uncommon and include bloating/GI upset. Use caution if any of these apply to you: None significant.
Creatine
Likely helpsIncreases phosphocreatine stores for faster ATP regeneration, boosting strength, power output, and cognitive function under stress.
Whey Protein
Likely helpsComplete protein with high leucine content that maximizes muscle protein synthesis — most researched protein supplement worldwide.
Beta-Alanine
Likely helpsIncreases muscle carnosine to buffer acid during high-intensity exercise, extending endurance for 1-4 minute efforts.
BCAAs
Probably helpsLeucine, isoleucine, and valine metabolized directly in muscle tissue — support protein synthesis and reduce exercise fatigue.
Explore: Best supplements for Athletic Performance
Reviewed by Dr. Baher Al Hakim · Last reviewed June 2026 · evidence from 10 studies · how we score · editorial policy
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.
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