Pea Protein Isolate
Also known as: Pisum sativum protein, PPI, Pea isolate
Isoelectric precipitation or ultrafiltration of Pisum sativum yields 80–85% protein dry matter. Naturally low in cysteine and methionine; high in arginine, lysine and BCAAs. DIAAS ≈ 0.82 (limiting AA: methionine).
Last reviewed: 2026-06-28 · 2 indexed studies
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Overview
Pea protein isolate is a yellow-pea-derived protein with the highest leucine content (~8%) of any single-source plant protein, making it the leading vegan substitute for whey. Limiting amino acid is methionine; otherwise its EAA profile and MPS response approach whey at adequate doses.
Mechanism & Function
Mechanism of Action
Provides EAAs and ~2 g leucine per 25 g serving, sufficient to activate mTORC1-mediated MPS — particularly when total daily protein is adequate and dosing is split across the day.
Physiological Role
Complete plant-protein source when paired with a methionine-rich food (rice, oats) or as part of total daily protein.
Primary Pathways
Performance / Health Relevance
Babault 2015 (NUTRALYS®) showed 25 g pea isolate twice daily produced bicep thickness gains statistically equivalent to whey over 12 weeks of resistance training in young men. Banaszek 2019 confirmed parity for strength and body composition in trained CrossFit athletes.
Evidence Review
No meta-analyses or systematic reviews indexed for this ingredient yet.
Dimensions marked N/A have no indexed evidence of that class. They are shown as unavailable rather than scored.
Practical Use & Dosage
- Minimum Effective Dose
- 25 g per serving
- Optimal Range
- 25–40 g per serving (slightly higher than whey to match leucine)
- Upper / Caution Level
- No defined upper limit within total-protein targets
- Timing
- Post-exercise and across the day for vegan athletes
- Best Format
- Isoelectric isolate; ideally paired with rice or oat protein for full AA balance
- Bioavailability
- DIAAS ≈ 0.82; ~94% true ileal digestibility.
- Absorption Considerations
- Naturally chalky texture and 'earthy' flavour; modern processing has improved palatability significantly.
Safety & Interactions
Side Effects
- •Mild GI discomfort
- •Earthy flavour
Contraindications
- Pea allergy (rare)
Drug Interactions
- •Minimal
Who Should Avoid
- •Pea / legume allergy
Monitoring
None.
Frequently Asked Questions
Auto-generated from indexed evidence — dosage, safety, interactions, and more.
When is Pea Protein Isolate typically used or indicated?
Pea Protein Isolate is most commonly used for: Vegan MPS, Lactose-free protein, Soy-free plant protein, Allergen-friendly formulations. Complete plant-protein source when paired with a methionine-rich food (rice, oats) or as part of total daily protein.
How does Pea Protein Isolate work?
Provides EAAs and ~2 g leucine per 25 g serving, sufficient to activate mTORC1-mediated MPS — particularly when total daily protein is adequate and dosing is split across the day.
What is the recommended dose of Pea Protein Isolate?
The optimal range is 25–40 g per serving (slightly higher than whey to match leucine). with a minimum effective dose of 25 g per serving. Best taken: Post-exercise and across the day for vegan athletes. Upper / caution level: No defined upper limit within total-protein targets.
What are the side effects of Pea Protein Isolate?
Reported side effects include: Mild GI discomfort; and Earthy flavour. Monitoring: None.
Does Pea Protein Isolate interact with medications?
Known or theoretical interactions: Minimal. Always check with a clinician before combining with prescription medication.
Who should avoid Pea Protein Isolate?
Pea Protein Isolate is generally not recommended for: Pea / legume allergy; and Pea allergy (rare).
How strong is the evidence for Pea Protein Isolate?
Evidence level: Strong (overall score 78/100), based on 2 indexed studies on SuppIndex.
Research & References (2)
Pea proteins oral supplementation promotes muscle thickness gains during resistance training: a double-blind, randomised, placebo-controlled clinical trial vs whey protein
Babault N et al. 12-week RCT with NUTRALYS® pea isolate — bicep thickness gains in pea group not significantly different from whey, both > placebo.
The effects of whey vs pea protein on physical adaptations following 8-weeks of high-intensity functional training (HIFT): a pilot study
Banaszek A et al. 8-week parallel-arm trial in trained CrossFit athletes — equivalent gains in body composition and strength across whey and pea groups.
Related Ingredients
Other top-rated ingredients in Proteins & Protein Powders.
Whey Protein Isolate (WPI)
94/100Microfiltered or ion-exchange purified whey to ≥90% protein. Lower in lactose and fat than WPC, preserving most bioactive fractions in CFM versions. DIAAS ≈ 1.09; leucine content ~11%.
Whey Protein Concentrate (WPC 80)
92/100Membrane-filtered (ultrafiltration/microfiltration) liquid whey concentrated to 70–80% protein dry matter. Retains higher levels of native bioactive fractions than isolate. PDCAAS = 1.0; DIAAS ≈ 1.09.
Micellar Casein
88/100Casein retained in its native micellar form (intact αs1, αs2, β and κ caseins assembled with colloidal calcium phosphate). Coagulates at gastric pH, dramatically slowing emptying.
Research Overview
Strong EvidenceCite this ingredient
One-click citation export in APA, MLA, Chicago, BibTeX, or HTML. The URL below is stable and safe to link.
Stable URL
https://thesuppindex.com/ingredients/pea-protein-isolate
SuppIndex. (2026). Pea Protein Isolate: Evidence summary, dosage and clinical studies. Retrieved October 16, 2026, from https://thesuppindex.com/ingredients/pea-protein-isolate
Based on 2 indexed studies · Evidence level: Strong.
Goal Ratings
Stack Compatibility
Combine with rice protein at 70:30 ratio for whey-equivalent DIAAS; pair with creatine post-workout.