Limited evidencePhysical performance

Hemp Protein

Hemp protein is a fiber-rich but moderate-quality plant protein with measured protein quality well below whey, casein or soy, and no human trials at all on muscle, strength or body composition. It is a whole-food-style protein, not a performance supplement.

What the science says

Protein quality is well below dairy and soy Moderate evidence
Laboratory analysis of 30 commercial hemp products found PDCAAS values of 49-53% for whole hemp seed, 46-51% for hemp seed meal and 63-66% for dehulled seed, with lysine the first limiting amino acid in every product. For comparison, whey, casein and soy protein isolate score about 1.00.
No trials on muscle, strength or recovery Limited evidence
There are no published randomized trials testing hemp protein for hypertrophy, strength, or exercise recovery. Every performance claim on a hemp protein label is extrapolated from general protein research done with other proteins.
High fiber content lowers protein density Moderate evidence
Commercial hemp powders are typically only 50-60% protein with substantial residual fiber, so a 30-40 g scoop delivers roughly 15-25 g of protein. The fiber helps satiety and regularity, but you need larger servings - and tolerate more GI bulk - to reach a useful protein dose.

Dosage & safety

Studied doseNo trial-based dose exists. If hemp is your primary protein, budget for the low PDCAAS and lysine limitation by eating more total protein or pairing it with a lysine-rich source such as pea or soy.

SafetyGenerally well tolerated; the fiber load can cause bloating and loose stools. Hemp foods contain trace THC and CBD; amounts are normally far below intoxicating levels, but positive workplace urine drug screens have been reported with heavy consumption of hemp products - relevant for tested athletes and safety-sensitive occupations. Rare hemp seed allergy exists, with reported cross-reactivity to other seeds.

Scientific references

Evaluating the quality of protein from hemp seed (Cannabis sativa L.) products through the use of the protein digestibility-corrected amino acid score method
House JD, Neufeld J, Leson G — J Agric Food Chem, 2010
A systematic review, meta-analysis and meta-regression of the effect of protein supplementation on resistance training-induced gains in muscle mass and strength in healthy adults
Morton RW, Murphy KT, McKellar SR, et al. — Br J Sports Med, 2018

Where to buy

Bob's Red Mill, Hemp Protein Powder, 16 oz (453 g)

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Related in Physical performance

Creatine (monohydrate) Strong evidence
Whey Protein Strong evidence
Caffeine Strong evidence
Beta-Alanine Moderate evidence
BCAA (Branched-Chain Amino Acids) Limited evidence
EAA (Essential Amino Acids) Moderate evidence