PROTEIN
Collagen vs Protein Powder
Complete vs incomplete protein, and what each is used for.
Compare →Protein comparison
Whey Protein vs Plant Protein
Protein per scoop, amino acid profile, dietary fit and cost per 20 g of protein.
Quick answer
Whey is a complete dairy protein with a relatively high leucine content. Plant proteins (pea, soy, rice, blends) are dairy-free and often vegan, but many have a lower share of essential amino acids and leucine, which blends and slightly larger servings can offset. For most shoppers the practical comparison is grams of protein per serving, other ingredients, and cost per 20 g of protein.
| Compare | Whey | Plant |
|---|---|---|
| Source | Milk (dairy) | Pea, soy, rice, hemp, blends |
| Complete proteinPublished research | Yes | Soy yes; others often blended to improve profile |
| Leucine / EAA sharePublished research | Relatively high | Often lower than whey |
| Dietary | Contains milk; isolate lower in lactose | Dairy-free; often vegan |
| Typical protein per scoop | 20–27 g | 18–25 g |
| Label watch-outs | Sweeteners, added amino acids | Sweeteners, gums, heavy-metal testing info |
Rows marked with a source type show where the information comes from. See how SuppScout compares.
Who might look at each
Whey Protein
- People who tolerate dairy
Plant Protein
- People avoiding dairy or animal products
These describe common reasons people consider each option — not a recommendation. There’s no universal winner.
Whey Protein and Plant Protein, explained
Whey Protein
Dairy protein from the whey portion of milk. Whey overview.
Plant Protein
Protein isolated from plants. Plant protein overview.
Key differences
- Whey has a higher leucine/EAA share on average.
- Plant proteins are dairy-free.
- Plant blends vary more between products.
Similarities
- Both are convenient ways to add protein.
- Both should be compared by protein grams per serving.
Published research
Research overview
The ISSN notes that total daily protein intake is the primary driver of training-related muscle outcomes. An analysis of commercially available plant protein isolates found generally lower essential amino acid content than animal proteins, with wide variation between sources.[1][2]
How to read product labels
- Compare grams of protein per serving, not scoop weight.
- Calculate cost per 20 g protein.
- Watch for added free amino acids that inflate protein numbers.
Products containing each
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References
- Jäger R, Kerksick CM, Campbell BI, et al. (2017). International Society of Sports Nutrition position stand: protein and exercise. Journal of the International Society of Sports Nutrition 14:20. pubmed.ncbi.nlm.nih.govPosition stand
- Gorissen SHM, Crombag JJR, Senden JMG, et al. (2018). Protein content and amino acid composition of commercially available plant-based protein isolates. Amino Acids 50(12). pubmed.ncbi.nlm.nih.govStudy
SuppScout links to primary and authoritative sources wherever possible. See our editorial policy for how sources are selected and how corrections are handled.
This page is educational and is not medical advice. Talk to a healthcare professional before starting a supplement, especially if you have a medical condition, take medications, or are pregnant or breastfeeding.