Research review
Does plant protein help with skin disease? What the research does and doesn't show
No trial has tested plant protein powder for acne or any other skin outcome; the research that exists on protein and skin is about dairy-derived whey protein, not plant sources.
No clinical trial has tested plant protein powder — pea, soy, rice or fava bean — against acne or any other skin outcome, in either direction. What research does exist looked at dairy and whey protein, and at diet broadly, not at plant protein specifically, so a plant protein shake causing or clearing acne is a claim nobody has actually tested.
What the evidence doesn't support
It doesn't support plant protein powder causing acne, and it doesn't support plant protein powder helping clear it either — no trial has isolated a plant protein source and measured acne outcomes at all. The research that exists on protein and skin looked at dairy-derived whey protein and at overall diet patterns, not at pea, soy, rice or fava bean protein isolates.
What the trials found
Two dermatology reviews covering the diet-and-acne literature — one spanning 2009–2020, one more recent — agreed on the same handful of dietary factors: high glycemic-index or glycemic-load diets and dairy products are associated with more acne, chocolate is implicated in some studies, and diets higher in omega-3 fatty acids, fruit and vegetables are associated with less. Neither review evaluated a plant protein powder as its own category; "protein" appears in this literature mainly as a search term used to pull in dairy and whey studies.
A 2024 narrative review of whey protein specifically, covering 21 preclinical and human studies, reported an association between whey protein supplementation and increased acne incidence, alongside effects on the liver, kidneys and gut microbiota at higher intakes. That finding is about whey — a dairy protein that naturally carries insulin-like growth factor and other hormonal components from milk. Plant proteins don't share that composition, but that's a difference in what dairy contains, not a tested result for plant protein; nobody has run the equivalent study on a pea, soy or fava bean protein powder.
Questions people ask
Can plant protein cause acne?
No trial has tested it, so there's no result to point to either way. The acne research that exists on a specific protein source is about whey, a dairy protein, not plant sources.
Does plant protein powder cause acne?
Same answer: untested. If someone notices skin changes after starting a new protein powder, that could reflect the powder's other ingredients — added sugars, flavoring, sweeteners — or something else in their diet entirely, not necessarily the protein itself.
Whey protein vs. plant protein for acne
A narrative review of whey protein found an association between whey supplementation and increased acne incidence. No comparable body of research exists for plant protein, so a head-to-head comparison for this specific outcome isn't something the trial data can answer.
When to talk to a doctor
Persistent, worsening or cystic acne is worth seeing a dermatologist about — they can identify hormonal, medication-related or other causes and discuss treatments with an actual evidence base behind them. Plant protein is not a treatment for acne or any other skin disease, and nothing above supports using it, or avoiding it, for that reason alone.
Related reading: plant protein side effects, what the research shows about plant protein, and who should not take plant protein.
Sources
- Diet and acne: review of the evidence from 2009 to 2020 A review of 53 studies on diet and acne (2009–2020) found dairy products and high glycemic-load diets linked to more acne, and fruit, vegetables and fatty acids linked to less; it did not evaluate plant protein powder as a category.
- Acne and diet: a review A review of acne-and-diet research found milk, chocolate and high glycemic-index diets linked to worse acne, and omega-3 fatty acids linked to improvement; it did not address plant protein.
- Investigating the Health Implications of Whey Protein Consumption: A Narrative Review of Risks, Adverse Effects, and Associated Health Issues A narrative review of 21 studies found whey protein supplementation associated with increased acne incidence; this is specific to whey, a dairy protein, not plant protein.
*These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.