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Faba Bean Protein (Vicia faba)

Vicia faba
Evidence Level
Limited
4 Clinical Trials
5 Documented Benefits
2/5 Evidence Score

Faba bean protein, also called fava bean protein, is a plant protein made from the seeds of Vicia faba and sold as a concentrate or a more refined isolate. It supplies all nine essential amino acids but is relatively low in the sulfur amino acids methionine and cysteine, so it is often blended with pea protein. The human evidence is early. In a small trial a single serving did not raise muscle protein synthesis after resistance exercise, and in a head-to-head comparison fava delivered fewer blood essential amino acids than pea or whey. Acute meal studies found that faba protein added to pasta lowered post-meal blood sugar and appetite. Fava beans contain vicine and convicine, natural compounds that can trigger a serious reaction called favism in people with G6PD deficiency, so anyone with that enzyme deficiency should avoid fava products, including this protein.

Studied Dose No clinical dose is established for muscle or weight goals. Muscle and amino acid studies used a single 0.33 g/kg serving, about 23 g for a 70 kg adult. Satiety studies used pasta with 25 to 35 percent faba flour or concentrate. Protein fortification typically uses 20 to 30 g/day.
Active Compound Faba (fava) bean protein from Vicia faba, as a concentrate or isolate; contains all nine essential amino acids, lower in methionine and cysteine.

Benefits

Plant protein with all nine essential amino acids

Faba bean protein provides all nine essential amino acids, but it is relatively low in the sulfur amino acids methionine and cysteine, which is why it is usually paired with other plant proteins such as pea. In a comparison in nine young men, a single serving of fava isolate supplied 67 percent of the daily indispensable amino acid requirement, against 77 percent for pea and 108 percent for whey.

Supported by Trial 2

Muscle protein synthesis after resistance exercise

In a double-blind trial in 16 healthy young adults, one 0.33 g/kg serving of fava bean protein taken right after knee-extensor resistance exercise did not raise the rate of muscle protein synthesis at rest or after exercise versus an amino-acid-free drink, even though the exercise itself raised it. This is one dose in a single study, not a measure of muscle growth over time.

Supported by Trial 1

Blood amino acid response compared with pea and whey

In nine young men given 0.33 g/kg of each protein, the post-meal rise in blood essential amino acids was largest with whey. The rise with whey was 57 percent greater than with fava, and the rise with pea was 28 percent greater than with fava. As a single large serving on its own, fava delivered fewer essential amino acids than the other two proteins.

Supported by Trial 2

Satiety and appetite after protein-enriched meals

In 54 young men, pasta made with faba bean protein concentrate or isolate lowered self-reported appetite and raised the fullness hormone PYY and the insulin-related marker C-peptide compared with ordinary wheat pasta. A separate study in 15 adults found faba-enriched pasta raised self-reported satiety without changing how much was eaten at the next meal. These are short meal studies, not weight-loss trials.

Supported by Trial 3, Trial 4

Post-meal blood sugar response when eaten in a meal

When faba bean protein concentrate or isolate was added to wheat pasta, the rise in blood sugar after the meal was lower than with ordinary pasta in a study of 54 young men. A study in 15 adults found faba-enriched pasta kept a low glycaemic and insulin response. These are acute meal measurements in people without diabetes, not a test of long-term blood sugar control.

Supported by Trial 3, Trial 4

Mechanism of action

1

Supplies amino acids that signal muscle protein synthesis

Like other dietary proteins, faba bean protein is digested into amino acids, including leucine, that help switch on the muscle protein synthesis machinery. Because fava is lower in methionine and, in one comparison, delivered fewer essential amino acids into the blood than pea or whey from the same single serving, its per-serving anabolic signal may be weaker unless the dose or total daily protein is raised.

2

Protein and the legume matrix support fullness

Protein tends to promote fullness, and the legume matrix adds to this. In a human meal study, faba bean protein added to pasta raised the gut fullness hormone PYY along with C-peptide and lowered appetite ratings, while slowing the post-meal rise in blood sugar. These are the proposed routes behind the satiety readings seen in the meal studies.

3

Vicine and convicine are oxidant glycosides

Fava beans contain the glycosides vicine and convicine, which the body converts to divicine and isouramil. These are potent oxidants that stress red blood cells. In people with G6PD deficiency this can cause sudden breakdown of red cells (favism). Processing such as boiling, roasting and fermentation lowers these compounds, but it is not established that a protein isolate holds little enough to be safe in G6PD deficiency.

Clinical trials

1
Fava Bean Protein and Muscle Protein Synthesis: Randomized Trial (null)
PubMed

Parallel, double-blind, randomized controlled trial of a single 0.33 g/kg serving of fava bean protein versus an amino-acid-free control taken right after one-leg resistance exercise (Davies et al. 2022, Nutrients)

16 healthy, recreationally active young men and women (8 fava protein, 8 control).

Resistance exercise raised the rate of muscle protein synthesis (p = 0.012), but fava bean protein did not raise it above the control drink at rest (p = 0.409) or after exercise (p = 0.732). The primary outcome was null: one serving of fava protein did not add to the exercise response in this small, short study.

2
Whey vs Pea vs Fava Protein: Blood Amino Acid Comparison
PubMed

Study of the blood essential amino acid response after a single 0.33 g/kg serving of whey, pea or fava bean protein isolate (Kozior et al. 2023, Nutrients)

9 healthy young adult men, each tested with whey, pea and fava isolate.

Essential amino acids made up 58 percent of whey, 46 percent of pea and 42 percent of fava protein, and one serving supplied 108, 77 and 67 percent of the daily requirement. The post-meal rise in blood essential amino acids was 57 percent greater with whey and 28 percent greater with pea than with fava. Fava delivered the fewest essential amino acids of the three.

3
Faba Bean Protein in Pasta: Blood Sugar and Appetite
PubMed

Acute meal study comparing wheat pasta with pasta carrying 25 percent whole faba flour, faba starch, faba protein concentrate or faba protein isolate, with blood and appetite measures over 120 minutes and a later test meal (Chan et al. 2019, Food Function)

54 young adult men.

Pasta made with faba bean protein concentrate or isolate lowered the post-meal rise in blood sugar and lowered appetite, and raised the satiety hormone PYY and the insulin marker C-peptide, versus plain wheat pasta. There was no effect on insulin or GLP-1. A single-meal study in people without diabetes.

4
Faba-Enriched Pasta: Satiety and Digestive Comfort
PubMed

Acute crossover meal study of wheat pasta versus pasta enriched with 35 percent faba bean flour, dried at a low or a very high temperature (Greffeuille et al. 2015, Food Function)

15 healthy volunteers.

Faba-enriched pasta kept a low glycaemic and insulin response. When dried at a very high temperature it reduced self-reported digestive discomfort and raised self-reported satiety, but it did not change how much was eaten at the next meal. A small single-meal study.

Side effects and drug interactions

Common Potential side effects

Favism: fava beans contain vicine and convicine, which the body turns into the oxidants divicine and isouramil and which can cause sudden breakdown of red blood cells (acute hemolytic anemia) in people with G6PD deficiency. G6PD deficiency is the most common enzyme deficiency in the world, and many people who have it do not know. It has not been shown that a fava protein concentrate or isolate holds little enough vicine and convicine to be safe in G6PD deficiency, so anyone with this deficiency should avoid fava products, including this protein, unless a doctor advises otherwise.
Fava (broad bean) allergy is uncommon but possible; stop and seek care if a reaction occurs. Fava is not one of the major allergens named in US food labeling, which is a labeling status and not proof that reactions cannot happen.
Mild gas, bloating or stomach upset can occur, especially with larger servings or with less refined concentrates that keep more fiber and natural plant compounds such as tannins.
Concentrated fava protein has not been studied in pregnancy or breastfeeding; ask a clinician first.
Faba bean protein is a food protein and is not a treatment for any disease; it does not replace medical care.

Important Drug interactions

Levodopa (Parkinson's medication): fava beans naturally contain L-DOPA, the same compound as the drug, so there is a theoretical additive effect; large protein meals can also change how levodopa is absorbed. Talk to your doctor about timing.
Monoamine oxidase inhibitors (MAOIs): fava beans contain compounds related to dopamine and L-DOPA, and a possible interaction with MAOIs has long been raised; separate from these medicines and ask a clinician.
No other drug interactions are established for faba bean protein as a food protein; most studies enrolled healthy volunteers rather than people on regular medicines.

Standardized & branded forms of Faba Bean Protein (Vicia faba)

Trademarked forms of Faba Bean Protein (Vicia faba) with their own profiles on NutraSmarts. Results from one branded form do not automatically carry over to another, so check each profile for the studies run on that specific product:

Muscle & Recovery
NUTRALYS® Fava Bean Protein (Vicia faba isolate — Roquette)
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Frequently asked questions about Faba Bean Protein (Vicia faba)

Is faba bean protein as good as whey for building muscle?

The evidence does not show that. In a head-to-head comparison, a single serving of fava protein delivered fewer blood essential amino acids than pea or whey, and in a small trial one serving did not raise muscle protein synthesis after resistance exercise. What matters most for muscle is total daily protein and enough leucine, so fava can contribute, usually at a larger serving or blended with pea.

Who should avoid faba bean protein?

People with G6PD deficiency, the most common enzyme deficiency worldwide, should avoid fava products, including this protein. Fava beans contain vicine and convicine, which can trigger a serious reaction called favism (sudden breakdown of red blood cells). It is not established that a protein concentrate or isolate is low enough in these compounds to be safe, so do not use it if you have this deficiency unless your doctor says otherwise.

How is this different from NUTRALYS Fava and PeptiStrong?

Faba bean protein is the generic ingredient. NUTRALYS Fava is one branded fava protein isolate made by Roquette, so it is a specific form of this protein. PeptiStrong is different: it is a fava bean peptide hydrolysate, broken down into selected peptides, and it is studied as its own product rather than as a plain protein. See their own pages for the details.

Can faba bean protein help with appetite or weight?

Short meal studies found that faba bean protein added to pasta lowered appetite and raised the fullness hormone PYY, and that faba-enriched pasta raised self-reported satiety. These are single-meal effects in people without diabetes, and none of the studies tested weight loss, so treat it as a filling, higher-protein option rather than a proven weight-loss aid.

What is Faba Bean Protein?

Faba bean protein, also called fava bean protein, is a plant protein made from the seeds of Vicia faba and sold as a concentrate or a more refined isolate. It supplies all nine essential amino acids but is relatively low in the sulfur amino acids methionine and cysteine, so it is often blended with pea protein.

What is Faba Bean Protein used for?

Faba Bean Protein is researched primarily for Muscle & Recovery and Weight Management. Faba bean protein provides all nine essential amino acids, but it is relatively low in the sulfur amino acids methionine and cysteine, which is why it is usually paired with other plant proteins such as pea.

What is the recommended dosage of Faba Bean Protein?

The clinically studied dose is No clinical dose is established for muscle or weight goals. Muscle and amino acid studies used a single 0.33 g/kg serving, about 23 g for a 70 kg adult. Satiety studies used pasta with 25 to 35 percent faba flour or concentrate. Always follow the product label and check with a healthcare provider for personal advice.

Is Faba Bean Protein safe, and does it have side effects?

For most healthy adults, Faba Bean Protein is well tolerated at studied doses. Reported effects can include: Favism: fava beans contain vicine and convicine, which the body turns into the oxidants divicine and isouramil and which can cause sudden breakdown of red blood cells (acute hemolytic anemia) in people with G6PD deficiency. It may also interact with some medications. Faba Bean Protein is not right for everyone, so check with a healthcare provider first if you are pregnant or breastfeeding, have a medical condition, or take prescription medication.

Does Faba Bean Protein interact with any medications?

Possible interactions include: Levodopa (Parkinson's medication): fava beans naturally contain L-DOPA, the same compound as the drug, so there is a theoretical additive effect; large protein meals can also change how levodopa is absorbed. Talk to your doctor about timing. If you take prescription medication, check with a pharmacist or doctor before using it.

How strong is the scientific evidence for Faba Bean Protein?

NutraSmarts rates the evidence for Faba Bean Protein as Limited (2 out of 5). It is backed by 4 clinical trials and 9 cited references summarized on this page. A higher rating reflects more, larger, and better-designed human studies.

References(9 citations)

Evidence ratings on NutraSmarts are based on the totality of human clinical research, with emphasis on randomized controlled trials, meta-analyses, and systematic reviews. The references below directly support claims made throughout this page.

  1. Davies RW, Kozior M, Lynch AE, Bass JJ, Atherton PJ, Smith K, Jakeman PM. The Effect of Fava Bean (Vicia faba L.) Protein Ingestion on Myofibrillar Protein Synthesis at Rest and after Resistance Exercise in Healthy, Young Men and Women: A Randomised Control Trial. Nutrients. 2022;14(18):3688. doi: 10.3390/nu14183688.PubMedUsed to support: Parallel, double-blind, randomized trial in 16 healthy young adults: a single 0.33 g/kg serving of fava bean protein after knee-extensor resistance exercise did not raise myofibrillar protein synthesis at rest (p = 0.409) or after exercise (p = 0.732), although exercise itself raised it (p = 0.012). The muscle-protein-synthesis outcome was null.
  2. Kozior M, Davies RW, Amigo-Benavent M, Fealy C, Jakeman PM. An Investigation of the Protein Quality and Temporal Pattern of Peripheral Blood Aminoacidemia following Ingestion of 0.33 g·kg(-1) Body Mass Protein Isolates of Whey, Pea, and Fava Bean in Healthy, Young Adult Men. Nutrients. 2023;15(19):4211. doi: 10.3390/nu15194211.PubMedUsed to support: Study in 9 healthy young men of single 0.33 g/kg servings of whey, pea and fava isolate: essential amino acids were 58, 46 and 42 percent of each protein and one serving supplied 108, 77 and 67 percent of the daily requirement; the post-meal rise in blood essential amino acids was 57 percent greater with whey and 28 percent greater with pea than with fava. Fava delivered the fewest essential amino acids.
  3. Chan CKY, Fabek H, Mollard RC, Jones PJH, Tulbek MC, Chibbar RN, Gangola MP, Ramadoss BR, Sánchez-Hernández D, Anderson GH. Faba bean protein flours added to pasta reduce post-ingestion glycaemia, and increase satiety, protein content and quality. Food Funct. 2019;10(11):7476-7488. doi: 10.1039/c9fo01186b.PubMedUsed to support: Acute meal study in 54 young men (registered NCT02658591): pasta made with faba bean protein concentrate or isolate lowered post-meal blood sugar and appetite and raised PYY and C-peptide versus wheat pasta, with no effect on insulin or GLP-1. Single-meal measures in people without diabetes.
  4. Greffeuille V, Marsset-Baglieri A, Molinari N, Cassan D, Sutra T, Avignon A, Micard V. Enrichment of pasta with faba bean does not impact glycemic or insulin response but can enhance satiety feeling and digestive comfort when dried at very high temperature. Food Funct. 2015;6(9):2996-3005. doi: 10.1039/c5fo00382b.PubMedUsed to support: Acute crossover study in 15 healthy volunteers: pasta enriched with 35 percent faba bean flour kept a low glycaemic and insulin response; dried at a very high temperature it reduced digestive discomfort and raised self-reported satiety without changing next-meal energy intake.
  5. Nosworthy MG, Medina G, Franczyk AJ, Neufeld J, Appah P, Utioh A, Frohlich P, House JD. Effect of Processing on the In Vitro and In Vivo Protein Quality of Beans (Phaseolus vulgaris and Vicia Faba). Nutrients. 2018;10(6):671. doi: 10.3390/nu10060671.PubMedUsed to support: Rodent growth-and-digestibility bioassay of processed beans: baked faba beans scored a protein digestibility corrected amino acid score (PDCAAS) of 66 percent and a digestible indispensable amino acid score (DIAAS) of 61 percent, and processing method changed the scores. An animal protein-quality assay, not a human outcome.
  6. Martineau-Côté D, Achouri A, Karboune S, L'Hocine L. Faba Bean: An Untapped Source of Quality Plant Proteins and Bioactives. Nutrients. 2022;14(8):1541. doi: 10.3390/nu14081541.PubMedUsed to support: Review of faba bean protein composition, amino acid profile, bioactive peptides and L-DOPA, and of anti-nutrients and allergens. The antioxidant, blood-pressure and other peptide activities it describes were shown in laboratory work, not in people taking faba bean protein; it supports background on composition and safety only.
  7. Lonnie M, Laurie I, Myers M, Horgan G, Russell WR, Johnstone AM. Exploring Health-Promoting Attributes of Plant Proteins as a Functional Ingredient for the Food Sector: A Systematic Review of Human Interventional Studies. Nutrients. 2020;12(8):2291. doi: 10.3390/nu12082291.PubMedUsed to support: Systematic review of human trials of extracted plant proteins. It is not fava-specific and pea is its most-studied source, so it describes extracted plant proteins as a class rather than faba bean protein in particular.
  8. La Vieille S, Lefebvre DE, Khalid AF, Decan MR, Godefroy S. Dietary restrictions for people with glucose-6-phosphate dehydrogenase deficiency. Nutr Rev. 2019;77(2):96-106. doi: 10.1093/nutrit/nuy053.PubMedUsed to support: Review for Health Canada: G6PD deficiency is the most common enzyme deficiency in the world, and fava beans are the only food with conclusive clinical evidence of triggering hemolytic anemia in people with the deficiency. Supports the favism caution.
  9. Beretta A, Manuelli M, Cena H. Favism: Clinical Features at Different Ages. Nutrients. 2023;15(2):343. doi: 10.3390/nu15020343.PubMedUsed to support: Narrative review of favism case reports: eating fava beans can cause hemolytic crisis in people with G6PD deficiency, with jaundice, dark urine, anemia and abdominal pain; severity is highest in young children and pregnant women, and transfusion is sometimes needed. Supports the favism caution.