Tier B

Rice Protein (Brown Rice Protein Isolate)

Also known as: Brown rice protein isolate · Oryza sativa protein · Rice protein concentrate

1 PMID anchor · MUSCULO · METABOLISM · Last reviewed 2026-06-04

Mechanism of action

  • Plant protein with low lysine (limiting amino acid) but moderate leucine
  • mTORC1 / muscle protein synthesis activation at sufficiently high doses (≥ 24-48 g)
  • Hypoallergenic profile relative to dairy and soy alternatives

Molecular + tissue targets

  • Skeletal muscle protein synthesis
  • Plant-based dietary protein adequacy
  • Common allergen avoidance

Dosage range

48 g / day post-exercise produced strength, performance and lean-body-mass gains equivalent to whey at the same dose over 8 weeks (Joy 2013 PMID 23782948 Nutrition Journal RCT in resistance-trained males); 25-30 g typical commercial serving sizes have less robust direct evidence at the single-dose level

Safety notes

Inorganic arsenic content in rice-based supplements is a watchpoint — choose products with arsenic disclosure / third-party tested batches; lysine-limiting profile is best addressed by blending with pea protein

Cross-market regulatory status

🇺🇸 FDA

GRAS · DSHEA dietary supplement · no specific health claim · qualifies for 21 CFR 101.79 "good source of protein" (≥ 10% DV) when serving size meets the threshold

🇪🇺 EFSA

Authorized protein claims (Reg 432/2012) for muscle mass + bone maintenance available when food source provides ≥ 12% energy from protein

🇧🇷 ANVISA

RDC 243/2018 dietary supplement · IN 28/2018 Anexo V alegação funcional verbatim: "As proteínas auxiliam na formação dos músculos e ossos." (Anexo III ≥ 8,4 g/dia adultos ≥ 19 anos · Anexo VII proteína de referência AAE/g)

Authorized claims · verbatim (4)

Direct quotes from each jurisdiction's framework · never paraphrased · with framework reference and conditions of use.

🇪🇺 EFSA · 3 claims

Reg 432/2012

Protein contributes to a growth in muscle mass.

Conditions: Reg 1924/2006 art 10(2) + Annex: claim may only be used for food which is at least a "source of protein" — ≥ 12% of energy value provided by protein

Authorized 2012

Reg 432/2012

Protein contributes to the maintenance of muscle mass.

Conditions: Reg 1924/2006 art 10(2) + Annex: claim may only be used for food which is at least a "source of protein" — ≥ 12% of energy value provided by protein

Authorized 2012

Reg 432/2012

Protein contributes to the maintenance of normal bones.

Conditions: Reg 1924/2006 art 10(2) + Annex: claim may only be used for food which is at least a "source of protein" — ≥ 12% of energy value provided by protein

Authorized 2012

🇧🇷 ANVISA · 1 claim

IN 28/2018 Anexo V alegação funcional

As proteínas auxiliam na formação dos músculos e ossos.

Conditions: IN 28/2018 Anexo V: alegação restrita aos suplementos cuja quantidade de proteína e perfil de aminoácidos essenciais atendam os Anexos III + VII

Authorized 2018

Common use cases

  • plant-based diet protein adequacy
  • dairy / soy allergen avoidance
  • high-dose blending with pea for complete amino acid profile
  • sarcopenia prevention
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