Pea Protein
Summary
Pea protein (25 g twice a day) matched whey for muscle thickness and strength gains over 12 weeks of resistance training in 161 young men, and 50 g a day raised muscle protein synthesis as much as whey in older men. Whey reduced exercise muscle damage more. Most trials were funded by Roquette, a pea protein maker.
Key facts
- A protein isolate from yellow peas, sold as a dairy-free protein powder[1]
- Muscle gains with training (similar to whey, C); muscle protein synthesis in older men (similar to whey, D); muscle damage after exercise (less effect than whey, D)[1][2][3][4]
- No difference between pea and whey in the 12-week training trial or in older men's muscle protein synthesis; whey lowered muscle damage markers more in two trials[1][2][3][4]
- Roquette, maker of NUTRALYS pea protein, funded the 12-week training trial (with employee authors), the older-men synthesis trial and the eccentric exercise trial; NewCare funded the older walkers trial[1][2][3][4]
- 5 graded human outcomes on this page
- October 10, 2026
How it works
EstablishedPea protein supplies essential amino acids that stimulate muscle protein synthesis; in older men an extra 50 g/day of pea protein raised integrated synthesis rates as much as whey.[2]
What the human research says
Human trials only, one row per outcome. The form column shows what each trial actually tested. Grades follow our evidence-grading policy.
At a glance: strongest evidence per outcome
| Outcome | Grade | Effect | Strongest evidence | Rows |
|---|---|---|---|---|
| Muscle | Grade C | Improved | RCT · n = 161 · 2015 | 3 rows |
| Recovery | Grade D | Mixed | RCT · n = 92 · 2020 | 2 rows |
Every graded row
| Outcome | Effect | Grade | Best evidence | PMID |
|---|---|---|---|---|
| Muscle thickness and strength with resistance training | Improved | Grade C | RCT · n = 161 · 2015 Men aged 18 to 35 starting 12 weeks of upper-limb resistance training Form: Pea protein (NUTRALYS) vs whey vs placebo · Dose: 25 g twice daily · Duration: 12 weeks Biceps thickness rose in all groups with only a trend toward group differences overall; pea beat placebo for thickness gains (significant in the weakest participants), with no difference between pea and whey. Strength rose similarly in all groups. | 25628520 (opens PubMed)Source [1] |
| Muscle damage and soreness after eccentric exercise | Mixed | Grade D | RCT · n = 92 · 2020 Non-athletic, non-obese men aged 18 to 55 Form: Pea protein vs whey vs water only · Dose: 0.9 g protein per kg body weight per day in three doses · Duration: 5 days after a 90-minute eccentric exercise bout Whey significantly lowered muscle damage markers versus water; pea had an intermediate, non-significant effect, and pea and whey did not differ. Neither protein changed soreness or fitness test results. | 32784847 (opens PubMed)Source [3] |
| Muscle damage after long-distance walking in older adults | No effect | Grade D | RCT · n = 47 · 2023 Physically active adults aged 60 and over (45 completed) Form: Pea protein vs whey vs placebo · Dose: 25 g per day · Duration: 13 days Pea protein did not reduce the rise in creatine kinase after a 20 to 30 km walk, while whey did; strength, muscle mass and soreness did not differ across groups. | 36678213 (opens PubMed)Source [4] |
| Muscle protein synthesis in older men | Improved | Grade D | RCT · n = 31 · 2024 Healthy men aged about 72 on a controlled diet at the protein RDA Form: Pea protein vs whey vs collagen · Dose: Extra 50 g/day (25 g at breakfast and lunch) · Duration: 8 days of supplementation after a 7-day RDA phase Integrated muscle protein synthesis rose with pea (1.59%/day) and whey (1.59%/day) compared with the RDA-only phase. | 38762187 (opens PubMed)Source [2] |
| Strength and body composition with high-intensity functional training | No effect | Grade D | RCT · n = 15 · 2019 Men and women doing high-intensity functional training Form: Pea protein vs whey · Dose: 24 g before and after exercise on training days and between meals on rest days · Duration: 8 weeks Squat and deadlift 1RM rose in both groups with no differences between pea and whey for any measure. | 30621129 (opens PubMed)Source [5] |
Forms
| Form | Elemental % | Absorption (human data) | GI tolerance | Studied for |
|---|---|---|---|---|
| Pea protein isolate | Varies[1][2][3][4][6] | Raised integrated muscle protein synthesis as much as whey in older men at 50 g/day.[2] | No adverse effects reported in the abstracts; rated safe and well tolerated in an 84-day trial.[6][1] | Resistance training, synthesis and recovery trials |
Studied doses
Doses studied in human trials ranged from 25 g of pea protein per day for 13 days to 25 g twice daily (50 g/day) for 8 days to 12 weeks; one recovery trial used 0.9 g per kg of body weight per day for 5 days.[4][2][1][3]
Interactions
Published interactions only: each row cites a source. No row means none was found in our sources, not that a combination is safe.
Who should be careful
- People with pea or legume allergy
- The trials cited here do not report on people with legume allergies; pea protein comes from yellow peas.[1]
Talk to your pharmacist or clinician before starting a supplement, especially if you take prescription medicines.
Safety
Pea protein is a food protein; trials of up to 12 weeks reported no safety concerns.
How to read the label
- Label dose vs clinical doseTrials used 25 g per serving, once or twice a day.[1][2][4]
- Protein per scoopCheck grams of protein per scoop rather than scoop weight, since trial doses refer to protein.[2]
- Branded ingredientThe largest training trial used NUTRALYS pea protein from Roquette, which funded it.[1]
Cost per studied dose, without the sales pitch
Compare any product you already have by the amount it delivers, not by capsule count or front-of-pack weight.
Cost per studied dose
Enter the price, servings and the amount per serving from your label.
Frequently asked questions
Is pea protein as good as whey for building muscle?
In a 12-week trial of 161 men, muscle thickness and strength gains did not differ between pea and whey at 25 g twice daily.[1]
Does pea protein work for older adults?
In older men, an extra 50 g/day of pea protein raised muscle protein synthesis as much as whey.[2]
Sources
- [1]Pea proteins oral supplementation promotes muscle thickness gains during resistance training: a double-blind, randomized, Placebo-controlled clinical trial vs. Whey protein.. J Int Soc Sports Nutr, 2015. RCT
- [2]The effects of whey, pea, and collagen protein supplementation beyond the recommended dietary allowance on integrated myofibrillar protein synthetic rates in older males: a randomized controlled trial.. Am J Clin Nutr, 2024. RCT
- [3]Effects of Whey and Pea Protein Supplementation on Post-Eccentric Exercise Muscle Damage: A Randomized Trial.. Nutrients, 2020. RCT
- [4]Supplementation with Whey Protein, but Not Pea Protein, Reduces Muscle Damage Following Long-Distance Walking in Older Adults.. Nutrients, 2023. RCT
- [5]The Effects of Whey vs. Pea Protein on Physical Adaptations Following 8-Weeks of High-Intensity Functional Training (HIFT): A Pilot Study.. Sports (Basel), 2019. RCT
- [6]Efficacy of Pea Protein Supplementation in Combination with a Resistance Training Program on Muscle Performance in a Sedentary Adult Population: A Randomized, Comparator-Controlled, Parallel Clinical Trial.. Nutrients, 2024. RCT
What changed
- First draft. Every PMID checked against NCBI E-utilities esummary (title and year taken from the record) and abstracts read for the cited rows.
- Adversarial review pass: every evidence row re-read against its whole PubMed abstract. Official sources: no NIH ODS or NCCIH page covers pea protein. Industry ties via coi.py and PMC statements: Roquette (25628520, 38762187, 32784847, 38999765), NewCare (36678213); 30621129 no external funding. 38999765 is cited for safety only (participant count not in the abstract). Retraction, expression-of-concern, erratum and withdrawn checks on all cited PMIDs: none flagged. Page set indexable.