To provide 2.7 g of leucine, the amino acid that triggers muscle building, you need 25 g of whey, but 38 g of pea protein: this is the calculation derived from a laboratory analysis of 35 commercial protein powders. Pea protein has nevertheless established itself as the reference plant-based alternative to whey, and several trials have compared them directly.
This guide brings together studies identified via PubMed, from manufacturing to metals measured in powders, distinguishing between vegetarian, who consume dairy products, and vegan.
Quality and muscle : a pea isolate contains approximately 80% protein, plenty of lysine, little methionine and less leucine than whey. Its DIAAS reaches 1.00 in humans in one study, 61% in pigs in another. In trials against whey with training, gains in strength and muscle did not differ significantly, but these trials are few in number, often small, and several are co-authored by the manufacturer.
Digestion and choice : well tolerated in trials, pea protein remains an emerging allergen, with possible cross-reactions with peanut. For a vegan, peas, ideally combined with rice, are the logical option; for those who consume dairy products, whey remains the richest in leucine.
- Pea protein: isolate, concentrate, manufacturing
- Amino acid profile: lysine, methionine, leucine
- PDCAAS and DIAAS: scores that depend on the method
- Muscle protein synthesis: peas versus whey
- Strength and muscle mass: peas versus whey trials
- Building muscle with peas: dose, distribution and creatine
- Combining peas and rice, or peas and milk
- Digestion, bloating and tolerance
- Pea allergy and cross-reactions with peanut
- Satiety, blood sugar, cholesterol and kidneys
- Heavy metals: what analyses have measured
- Peas or whey: for whom?
- Frequently asked questions
Pea protein: isolate, concentrate, manufacturing
Pea proteins are mainly globulins, legumin (11S) and vicilin (7S), and albumins (2S). Manufacturing seeks to separate them from the starch and fibers of the seed.
<<<14>>> Aqueous fractionation fractionnement aqueux chains together grinding, alkaline extraction, centrifugation, precipitation at the isoelectric point, washing and drying, often by spray drying: it makes it possible to obtain isolates, the most concentrated. Dry fractionation, by air separation, yields concentrates. According to a 2022 review, in mice, concentrates obtained by dry separation were less digestible than isolates, especially for peas, and for fava beans, trypsin inhibitors, an antinutritional factor, persisted in the dry concentrate but were greatly reduced in the isolate.
The actual content was measured. In an analysis of 35 commercial protein powders published in 2018, the three pea samples contained 77 to 81% protein, at the level of brown rice (79%) and within the range of wheys (72 to 84%). The content varied from one supplier to another, and a flavored powder contains slightly less.
Compare the amount of protein per serving and per 100 g indicated on the packaging, rather than the word "isolate" alone.
The amino acid profile: lysine, methionine, leucine
It is mainly the essential amino acids that stimulate muscle protein synthesis, and among them leucine, which activates the building signal. The 2018 analysis measured them powder by powder using the same method.
Pea protein contains 30% essential amino acids, above the reference requirement for adults, versus 43% for whey. Its lysine reaches 5.9%, above the reference requirement of 4.5% and well above brown rice (2.4%) or wheat (1.4%). Its methionine, on the other hand, is only 0.4%, far from the requirement of 1.6%: it is its limiting amino acid. Its leucine exceeds the reference requirement of 5.9%, but remains lower than that of whey, at 11.0%.
| Protein | Measured Profile | For 2.7 g of leucine |
|---|---|---|
| Peas | Lysine 5.9%, methionine 0.4%, essential amino acids 30% | 38 g of protein |
| Brown Rice | Lysine 2.4%, methionine 2.5%, essential amino acids 28% | 37 g of protein |
| Soy | Lysine 4.6%, methionine 0.4%, essential amino acids 27% | 40 g of protein |
| Whey | Leucine 11.0%, essential amino acids 43% | 25 g of protein |
| Reference Requirement | Lysine 4.5%, methionine 1.6%, leucine 5.9% | Benchmark of 25 g of whey |
The benchmark of 2.7 g of leucine corresponds to 25 g of whey, a dose that significantly stimulates muscle protein synthesis. It takes 38 g of peas to achieve it. The authors note that the reasoning is theoretical: all amino acids remain necessary, and a lack of methionine may limit subsequent effects.
Our article plant or animal proteins expands the comparison, and our selection ofprotein-rich foods helps complement peas on your plate.
PDCAAS and DIAAS: scores that depend on the method
The PDCAAS corrects the amino acid profile by digestibility measured in feces and caps the score at 1. The DIAAS, more recent, uses the digestibility of each amino acid measured at the end of the small intestine, where they are absorbed. A DIAAS of 1.00 (or 100%) means that the protein meets the requirements for each essential amino acid.
In 15 healthy volunteers, a pea isolate labeled with nitrogen-15 was digested at 93.6%, compared to 96.8% for casein, with no significant difference; however, leucine, valine, lysine, and phenylalanine were slightly less digestible in peas. The calculated DIAAS reached 1.00 for peas and 1.45 for casein. Three of the ten authors, including the first author, were affiliated with the manufacturer of the tested isolate.
Guillin FM, Gaudichon C, Guérin-Deremaux L, et al. Am J Clin Nutr 2022;115(2):353-363. DOI: 10.1093/ajcn/nqab354
Other teams find lower values. In 6 pigs equipped with an ileal cannula, the DIAAS of a pea isolate was 61%, compared to 96% for a whey concentrate. Another study on ileal digestibility classifies pea and rice concentrates below 75%, and whey isolate above 100% for children over 3 years old. The difference is attributable to species, product, and method.
Pea contains all essential amino acids without being the exact equivalent of milk. These scores apply to powders, not to whole cooked peas. Its weak point, methionine, is corrected by combining it with a cereal.
Muscle protein synthesis: pea versus whey
Measured over a few hours, protein synthesis alone does not predict long-term gains. After pea, amino acids rise less in the blood : in 50 young men, 0.25 g per kilogram of lean mass after a workout elevated them more with whey, with no difference in mTORC1 activation, the cellular switch for muscle growth.
A 2026 network meta-analysis of 51 trials ranks pea second for post-workout protein synthesis, behind native whey, but only whey reached a statistically significant effect, and the authors call for caution regarding understudied sources, such as pea. The highest predicted responses corresponded to 18 to 25 g.
In 27 adults aged 50 to 70 years following for 10 days a diet of 1.0 g of protein per kilogram per day, predominantly animal-based supplemented with whey, or predominantly plant-based supplemented with pea protein, with leg training every other day, myofibrillar protein synthesis of the trained leg reached 1.44% per day with whey and 1.50% with pea, with no difference between groups. Kidney function was not altered.
Korzepa M, Quinlan JI, Marshall RN, et al. Am J Clin Nutr 2025;122(1):122-136. DOI: 10.1016/j.ajcnut.2025.04.019
According to a Maastricht University review, three strategies compensate for the weaker response to plant proteins: consume more of them, combine them with each other, or fortify them with the missing amino acid.
Strength and muscle mass: pea versus whey trials
Four trials directly compared pea protein alone to whey. They point in the same direction, with limitations.
In 161 men aged 18 to 35 years following 12 weeks of arm resistance training, with 25 g of pea, whey, or placebo twice daily, biceps thickness increased from 24.9 to 27.3 mm on average, across all groups combined, with only a trend toward a difference between groups. In those who were weaker at baseline, it increased by 20.2% with pea, 15.6% with whey, and 8.6% with placebo: pea performed better than placebo, whey differed from neither. Strength improved comparably in all three groups. Three of seven authors worked for the pea product manufacturer tested.
Babault N, Païzis C, Deley G, et al. J Int Soc Sports Nutr 2015;12(1):3. DOI: 10.1186/s12970-014-0064-5
In sedentary adults aged 30 to 59 years, 84 days of resistance training with approximately 20 g per day of pea or whey isolate improved overall strength by 16.1% with pea (significant) and by 11.1% with whey (not significant), muscle mass by 2.3% and 2.4%. No difference between groups was significant; the authors mention high individual variability, and this should not be read as pea superiority. Three of eight authors worked for the pea product manufacturer tested.
In 15 high-intensity functional training practitioners, 8 weeks with 24 g of whey or pea around workouts produced similar strength gains, with no difference between groups: a pilot trial, with 7 to 8 people per group. In 92 untrained men, after an intense eccentric workout, whey reduced muscle damage markers compared to water, pea had a non-significant intermediate effect, with no difference between the two proteins nor effect on muscle soreness; three of eight authors worked for the pea product manufacturer tested.
| Trial | Population and dose | Pea versus whey result |
|---|---|---|
| Babault, 2015, 12 weeks | 161 men aged 18 to 35 years, 2 × 25 g per day | Biceps thickness and strength with no significant difference between pea and whey |
| Banaszek, 2019, 8 weeks | 15 practitioners, men and women, 24 g around training sessions | Similar strength gains, no difference between groups |
| Nieman, 2020, 5 days | 92 men aged 18 to 55 years, 0.9 g per kilogram per day | Muscle damage: whey better than water, pea intermediate, no difference between pea and whey |
| Singh, 2024, 84 days | Sedentary adults aged 30 to 59 years, approximately 20 g per day | Strength +16.1% and +11.1%, muscle +2.3% and +2.4%, no difference between groups |
| Santini, 2025, 12 weeks | 44 young male beginners, 3 × 15 g per day of soy and pea | Lean mass +2.4 and +2.5 kg, bench press +64 and +63 kg, no difference |
Meta-analyses provide a nuanced picture. One covering 16 publications found no effect of protein source on absolute lean mass or strength, but a slight advantage of animal proteins for lean mass percentage, and 0.41 kg more lean mass in those under 50 years old. A 2026 network meta-analysis of 36 trials ranks whey first for lean mass (+1.24 kg versus placebo) and attributes weaker effects to plant-based proteins, with low to very low certainty.
For those consuming dairy products, a whey isolate remains the most direct way to deliver substantial leucine in few grams; our article on proven whey benefits details its data.
Building muscle with pea: dosage, distribution, and creatine
According to a meta-analysis of 49 trials, protein supplementation adds on average 2.49 kg of maximum strength and 0.30 kg of lean mass during a resistance training program, and lean mass gains plateau around 1.6 g of protein per kilogram per day. Our guide for building muscle details the calculation.
With pea, plan slightly more generous servings: approximately 38 g to match the leucine content of 25 g of whey. Studies used 20 to 25 g per serving, one to two times per day. These benchmarks are deductions, as no trial has compared multiple pea doses.
The creatine is particularly important in a plant-based diet. In an 8-week resistance training trial with 18 vegetarians and 24 non-vegetarians, baseline muscle creatine was lower in vegetarians (117 vs 130 mmol per kilo), and with creatine supplementation they showed greater increases in muscle creatine, lean mass, and total work output. The dose was calculated based on lean mass, not fixed; the summary does not specify whether some participants were vegan.
The International Society of Sports Nutrition position considers creatine safe and well tolerated in healthy individuals, including over long periods. It describes a loading phase followed by 3 to 5 g per day, or 3 g per day for 28 days, an option that builds muscle reserves more gradually. Our Creatine Creapure in vegetable capsules provides 3 g per day, our creatine monohydrate powder 5 g per day; these are not recommended for children, adolescents, and pregnant or nursing women, with adequate hydration. See our creatine guide and when to take it.
Combine peas and rice, or peas and milk
Peas are rich in lysine and low in methionine, brown rice the opposite. According to 2018 analysis, compensating for the deficiency with a single protein requires consuming 2 to 4 times more, whereas an equal-parts blend requires only 10 to 90% more protein.
In 10 trained young adults (8 men, 2 women), 32 g of a blend containing 39.5% peas, 39.5% brown rice, and 21% canola after a leg session stimulated myofibrillar protein synthesis as much as 32 g of whey over 4 hours, whereas blood amino acid availability was approximately 44% higher with whey.
van der Heijden I, Monteyne AJ, West S, et al. Med Sci Sports Exerc 2024;56(8):1467-1479. DOI: 10.1249/MSS.0000000000003432
In 24 young men, 30 g of a blend of wheat, corn, and peas stimulated muscle protein synthesis with no significant difference compared to 30 g of milk protein, and over 12 weeks, the Brazilian trial cited above achieved gains with a soy and pea blend with no significant difference compared to whey. A review of 24 studies concludes that well-formulated blends can stimulate muscle protein synthesis as much as whey starting from approximately 30 g providing around 2.5 g of leucine, emphasizing the small size of the trials.
For vegetarians who consume dairy products, peas also pair with milk: in pigs, 25% pea isolate and 75% whey concentrate achieved a DIAAS of 104%. This option does not apply to vegans; for others, a whey isolate can complement a diet rich in legumes.
A split pea dahl with rice or hummus with whole grain bread apply the same principle: practical advice drawn from measured nutritional profiles, not from trial results.
Digestion, bloating, and tolerance
Whole legumes are among the main sources of FODMAP, fermentable carbohydrates (fructans, galacto-oligosaccharides, polyols, excess fructose, lactose in those who digest it poorly) that draw water into the intestine and produce gas, hence pain and bloating in sensitive individuals, particularly in cases of irritable bowel syndrome.
An isolate is not a seed, but we found no study in PubMed measuring the FODMAP content of commercially sold pea isolates : we cannot assert that they are free of them. Studies show, however, good tolerance: over 84 days, the digestive symptom score (bloating, gas, pain, transit) decreased by 30.5% with pea and by 43.1% with whey, with no difference between groups, and no adverse effects were deemed possibly related to the product.
On the whey side, the question is that of lactose : according to a review of 36 trials, most lactose-intolerant adults tolerate 12 to 15 g of lactose, approximately one cup of milk, and the lactose content of whey is listed on the label. In case ofmilk protein allergy, whey should be excluded, and pea becomes the logical alternative, unless there is a legume allergy.
Half-dose at first, plenty of liquid, not at the same time as a meal already rich in legumes: common-sense advice, not trial results. Persistent symptoms, weight loss, or blood in the stool warrant a consultation.
Pea allergy and cross-reactions with peanut
Allergies to legumes such as pea, lentil, or lupine are more frequently reported. A 2024 review notes severe reactions particularly for pea and lupine, most often through cross-reactions between similar proteins, based on data that still rely mainly on isolated cases.
Pea vicilin, Pis s 1, shares with Ara h 1, a major peanut allergen, a large portion of the zones recognized by IgE antibodies, according to modeling. In patients allergic to green pea, lupine, lentil, or bean, peanut allergy was frequent (64.7 to 77.8%); conversely, in those allergic to peanut or soy, allergy to another legume remained infrequent (16.7% at most), and cross-sensitization most often had no clinical manifestation.
At Nancy University Hospital, among 195 children allergic to peanut, 122 were sensitized to another legume and 34 had confirmed allergy, mainly to lentil, lupine, and pea; half of these reactions were severe.
If you are allergic to peanut, soy, lentil, or lupine, do not test pea protein on your own: an allergist can assess the risk through skin tests, IgE measurements, or supervised provocation testing. Sensitization does not always mean allergy; only medical evaluation can determine this. Any sign of generalized reaction after ingestion, swelling, breathing difficulty, or discomfort requires calling emergency services.
Satiety, blood sugar, cholesterol, and kidneys
Satiety. In 32 men, 20 g of protein taken 30 minutes before a free meal reduced food intake only with casein and pea, compared to water; taken at the start of the meal, no additional effect. In another trial in 32 adults, 24 g of casein or pea reduced appetite over 4 hours more than soy, with no difference in the following meal. See also our guidelines on proteins for cutting.
Blood sugar. In 31 healthy adults, adding 25 g or 50 g of pea protein to 50 g of glucose reduced the glycemic response by 31% and 53%, while increasing insulin by 28% and 40%. This acute trial, in people without diabetes, is co-signed by the manufacturer of the tested pea, as is the following one, whose authors see an advantage of pea over whey, although the difference in blood sugar between the two proteins was not tested as significant: only the insulin response was clearly lower with pea.
In 30 healthy adults, the area under the blood sugar curve over 3 hours changed from 143.2 with glucose alone to 89.8 with 20 g of pea protein and to 98.5 with 20 g of whey. The area under the insulin curve reached 4,305 with pea versus 6,312 with whey.
Thondre PS, Young E, Pledger S, et al. PLoS One 2026;21(1):e0340386. DOI: 10.1371/journal.pone.0340386
Cholesterol and kidneys. In the 10-day trial in 50- to 70-year-olds, non-HDL cholesterol decreased in the pea group only, from 3.89 to 3.37 mmol/L, with no change in kidney function; a trial this short does not allow for concluding a lasting effect. A meta-analysis of 28 trials in 1,358 adults without kidney disease shows that high-protein diets (at least 1.5 g per kilogram per day, 20% of calories, or 100 g per day) do not alter the course of glomerular filtration. In case of kidney disease, protein intake should be discussed with a physician.
Heavy metals: what the analyses measured
An analysis of 30 sports proteins sold in China found at least one metal in each product. Plant-based products contained on average more lead (0.18 versus 0.06 mg/kg) and cadmium (0.05 versus 0.01 mg/kg) than dairy products, with a maximum for a cocoa brown rice protein (lead 0.60 mg/kg). The modeled risk remained below the alert threshold at 30 g and even at 90 g per day, and only exceeded it for the heaviest consumers in the most unfavorable scenario; the predicted increase in blood lead remained below 3 µg/dL.
A 2020 risk assessment, based on published data for 15 and then 133 protein powders, found no increased risk at one or three doses per day; the lowest indices concerned wheys, the highest those for mass-gaining formulas.
These studies do not specifically address pea protein, and the most contaminated product was rice and cocoa-based. They encourage respecting recommended doses and not multiplying powders, without justifying the elimination of pea from a vegan diet.
Pea or whey: for whom?
The vegetarian who consumes milk and eggs can choose either one; the vegan turns to pea and other plant-based proteins.
| Situation | Most logical option | Why |
|---|---|---|
| Omnivore or vegetarian who consumes dairy | Whey, or pea and whey blend | More leucine per gram: 25 g is sufficient for 2.7 g of leucine |
| Vegan | Pea, ideally combined with rice | Completed profile, gains with no significant difference from whey in trials at comparable doses |
| Milk protein allergy | Pea, after medical consultation | Whey is a milk protein, therefore must be excluded |
| Lactose intolerance | Pea, or whey depending on the lactose content on the label | 12 to 15 g of lactose is tolerated by most lactose-intolerant adults |
| Peanut or legume allergy | Allergist consultation before pea protein | Cross-reactions possible, sometimes severe |
| Over 50 years old | Either one, with adequate intake | Comparable muscle synthesis over 10 days, no difference in lean mass in 29 trials |
In those over 50, a meta-analysis of 29 trials found no difference between plant and animal proteins on lean mass or grip strength, but 25 trials focused on soy. See our article on sarcopenia after 50 years.
For athletes who consume dairy products, our Whey 100% isolate provides 22.9 g of protein per 30 g serving; it is a milk protein, therefore not suitable for a vegan diet. For vegans, the essential factors also play out beyond the powder: total intake, variety of legumes and cereals, and vitamin B12. Our protein powder comparison helps you read the labels.
An isolated whey protein, 22.9 g of protein per 30 g serving, to simply supplement your intake around training if you consume dairy products. A milk protein, reserved for omnivores and vegetarians who consume milk.
View Whey IsolateOur Creapure Creatine in vegetable capsules pairs with any protein source.
Frequently Asked Questions
What are the benefits of pea protein?
It provides approximately 80% protein in analyzed powders, plenty of lysine and all essential amino acids. With strength training, it has supported gains in strength and muscle with no significant difference from whey in direct trials.
Pea protein or whey: which to choose?
If you consume dairy products, whey provides more leucine per gram: 25 g is sufficient for 2.7 g of leucine, compared to approximately 38 g of pea. If you are vegan or allergic to milk proteins, pea, ideally combined with rice, is the logical option.
Is pea protein as effective as whey for building muscle?
In trials lasting 8 to 12 weeks with training, gains did not differ significantly. These trials are few in number, often small, and several are co-signed by the manufacturer. Larger meta-analyses give a slight advantage to animal proteins for lean mass.
Does pea protein cause bloating?
Whole legumes are rich in FODMAPs, which can cause bloating. The FODMAP content of isolates has not been measured in the studies found, but in an 84-day trial, the digestive tolerance of pea did not differ from whey.
Is pea protein a complete protein?
It contains all essential amino acids, but is low in methionine: 0.4% compared to a reference requirement of 1.6%. Its DIAAS reached 1.00 in humans in one study and 61% in pigs in another. Combining it with rice corrects this weakness.
Why combine pea protein and rice protein?
Pea is rich in lysine and poor in methionine, brown rice the opposite. A mixture in equal parts covers requirements with 10 to 90% more protein compared to 2 to 4 times more with a single source.
Can you be allergic to pea protein?
Yes. Pea is an emerging allergen, with sometimes severe reactions, and its vicilin resembles a major peanut allergen. In case of peanut allergy or other legume allergy, consult an allergist before consuming it.
How much pea protein to take per day?
The powder supplements your diet to reach approximately 1.6 g of protein per kilogram per day for muscle gain. Trials used 20 to 25 g per serving, once or twice per day, and approximately 38 g of pea equals the leucine of 25 g of whey.
Does pea protein contain heavy metals?
Traces of metals have been measured in powdered proteins in general, more on average in plant-based powders than dairy powders, according to an analysis of 30 products, with modeled risk low at usual doses. Follow the recommended doses.
Is pea protein bad for the kidneys?
Nothing suggests it in healthy individuals: kidney function did not change in a 10-day trial, and a meta-analysis of 28 trials finds no effect from high-protein diets. In case of kidney disease, consult your doctor.
Can a vegetarian take whey?
Yes, if they consume dairy products: whey is a milk protein. A vegan will turn to plant-based proteins such as pea, rice or soy.
Does pea protein cause weight gain?
Not by itself: weight depends on caloric balance. In an 84-day trial with training, weight remained stable with pea while muscle mass increased by 2.3%.
Sources
The studies cited below were identified via PubMed.
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- Thondre PS, Achebe I, Sampson A, et al. Co-ingestion of commercial pea protein and a carbohydrate-rich beverage influences glycemic, insulinemic, GIP and GLP-1 responses: preliminary results from a randomized trial. European Journal of Nutrition, 2021;60(6):3085-3093. DOI
- Thondre PS, Young E, Pledger S, et al. Randomized trial in healthy participants comparing the insulinogenic effects of whey and pea protein combined with glucose. PLoS One, 2026;21(1):e0340386. DOI
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