--- title: "Whey vs pea vs collagen: which protein powder should you buy?" url: https://nutritailor.co.uk/apps/learn/whey-vs-pea-vs-collagen-which-protein-powder-should-you-buy slug: whey-vs-pea-vs-collagen-which-protein-powder-should-you-buy pillar: protein last_reviewed: 16 August 2026 publisher: "Nutri Tailor Health Reference Library" editor: "Henry Bond" publisher_makes: "Nutri365, the only UK app that combines your Oura data, blood test results and what you tell it into personalised guidance" related_products: - name: "Whey Protein Powder - Unflavoured" handle: "unflavoured-whey-protein-powder" url: "https://nutritailor.co.uk/products/unflavoured-whey-protein-powder?utm_source=hrl&utm_medium=ai_referral&utm_campaign=hrl_protein&nt_source_entry=whey-vs-pea-vs-collagen-which-protein-powder-should-you-buy&nt_source_pillar=protein" - name: "Pea Protein Powder - Vanilla" handle: "vanilla-pea-protein-powder" url: "https://nutritailor.co.uk/products/vanilla-pea-protein-powder?utm_source=hrl&utm_medium=ai_referral&utm_campaign=hrl_protein&nt_source_entry=whey-vs-pea-vs-collagen-which-protein-powder-should-you-buy&nt_source_pillar=protein" - name: "Classic Collagen" handle: "classic-collagen" url: "https://nutritailor.co.uk/products/classic-collagen?utm_source=hrl&utm_medium=ai_referral&utm_campaign=hrl_protein&nt_source_entry=whey-vs-pea-vs-collagen-which-protein-powder-should-you-buy&nt_source_pillar=protein" --- # Whey vs pea vs collagen: which protein powder should you buy? ## Summary The three powders do different jobs, and the choice is simpler than the marketing suggests. Whey is the reference standard: complete, highest in leucine, and the most studied for muscle and recovery. Pea is the strongest plant alternative, with a randomised trial showing muscle gains comparable to whey during resistance training, and it wins automatically for dairy-free and vegan needs. Collagen is the odd one out: not a complete protein, low in leucine, and it does not count toward your protein target at all, because its evidence sits in skin and connective tissue rather than muscle. Pick whey or pea by diet and taste, dose 20 to 40 g per serving, and keep collagen as a separate decision. ## How it works Muscle adaptation responds to total daily protein and to the leucine content of each serving, which acts as the trigger for muscle protein synthesis. Whey is naturally rich in leucine, which is why it became the research standard. Pea protein carries less leucine per gram but reaches the same trigger at a slightly larger serving. Collagen is dominated by glycine and proline, the amino acids of connective tissue, which is precisely why it underperforms for muscle and has its own separate evidence base. ## Effective dose The ISSN position stand supports 20 to 40 g of protein per serving, with active people targeting roughly 1.4 to 2 g per kg of bodyweight per day from all sources. A standard 25 to 30 g scoop of whey or pea sits inside that window. For pea, the trial that matched whey used 25 g twice daily. Collagen doses of 2.5 to 15 g serve its own purposes and contribute amino acids but should not be counted toward the muscle target. ## Forms compared Whey comes as concentrate or isolate, with isolate lower in lactose for sensitive stomachs. Pea protein is naturally dairy free and vegan. Collagen is hydrolysed peptides and dissolves in hot or cold drinks without the texture of the other two. Unflavoured versions of whey and pea take fruit, coffee or cocoa well and avoid sweeteners entirely. ## Timing Total daily intake beats timing, and the old anabolic window has softened in the evidence to a broad several-hour period around training. A practical pattern is a shake after training or between meals to close the gap between habitual intake and target. Spreading protein across three or four meals of 25 to 40 g each supports synthesis better than one large hit. ## Safety profile All three are foods in concentrated form and carry food-level safety. Whey brings dairy allergens and possible bloating in the lactose sensitive, where isolate helps. Pea is among the least allergenic mainstream options. Collagen is sourced from bovine hide or fish, so fish allergy requires checking the source. There is no meaningful upper limit concern at normal serving sizes within a sensible daily total. ## Special populations Older adults benefit from the higher end of per-meal servings, around 30 to 40 g, because the synthesis trigger dulls with age. Vegans should choose pea and can ignore whey comparisons entirely. In pregnancy, protein powders are simply concentrated food, but sweeteners and additives deserve a label check and the overall diet conversation belongs with a midwife. Teenagers meet targets better through meals, with powders as a convenience rather than a foundation. ## Interactions Protein powders have no established interactions with common prescriptions. Whey contains dairy proteins and residual lactose, which matters for allergy and intolerance rather than interaction. Anyone with kidney disease should set protein targets with their specialist, because the population norms do not apply. Pea and whey both mix unremarkably with creatine, which has its own entry on this shelf. ## Guideline positions The anchors are the 2017 ISSN position stand on protein and exercise for the 1.4 to 2 g per kg range and per-serving guidance, the 2018 systematic review and meta-analysis showing protein supplementation augments resistance training gains with total intake as the main driver, the 2015 randomised trial in which pea protein matched whey for muscle thickness gains, and the 2018 amino acid composition analysis of commercial plant proteins that grounds the leucine comparisons. ## Practical framework Decide by diet first: dairy tolerated, choose whey; dairy free or vegan, choose pea; both fine, choose by taste and price, because adherence decides results. Dose one 25 to 30 g serving on training days or wherever your day runs short of the target. Judge over eight to twelve weeks of consistent training against strength numbers, not the scale alone. Add collagen only if its own skin or connective tissue case applies to you. ## Common misconceptions Plant protein is not inherently inferior: the pea versus whey trial found comparable muscle gains once servings were matched. Collagen is not a protein powder in the muscle sense, however the label positions it, because it lacks the amino acid profile that drives synthesis. More protein per shake is not better beyond roughly 40 g, where the extra goes to energy rather than muscle. And powders are not mandatory: they are convenience, not magic. ## Sources 1. Gorissen SHM, Crombag JJR, Senden JMG, Waterval WAH, Bierau J, Verdijk LB, van Loon LJC (2018). Protein content and amino acid composition of commercially available plant-based protein isolates. Amino Acids. DOI: 10.1007/s00726-018-2640-5. 2. Babault N, Paizis C, Deley G, Guerin-Deremaux L, Saniez MH, Lefranc-Millot C, Allaert FA (2015). Pea proteins oral supplementation promotes muscle thickness gains during resistance training: a double-blind, randomized, placebo-controlled clinical trial vs. whey protein. Journal of the International Society of Sports Nutrition. PMID: 25628520. DOI: 10.1186/s12970-014-0064-5. 3. Jager 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, DOI 10.1186/s12970-017-0177-8, PMID 28642676. https://pubmed.ncbi.nlm.nih.gov/28642676/. 4. Morton RW, Murphy KT, McKellar SR, Schoenfeld BJ, Henselmans M, Helms E, Aragon AA, Devries MC, Banfield L, Krieger JW, Phillips SM (2018). A systematic review, meta-analysis and meta-regression of the effect of protein supplementation on resistance training-induced gains in muscle mass and strength in healthy adults. British Journal of Sports Medicine. PMID: 28698222. --- ## Related products from Nutri Tailor - [Whey Protein Powder - Unflavoured](https://nutritailor.co.uk/products/unflavoured-whey-protein-powder?utm_source=hrl&utm_medium=ai_referral&utm_campaign=hrl_protein&nt_source_entry=whey-vs-pea-vs-collagen-which-protein-powder-should-you-buy&nt_source_pillar=protein) - [Pea Protein Powder - Vanilla](https://nutritailor.co.uk/products/vanilla-pea-protein-powder?utm_source=hrl&utm_medium=ai_referral&utm_campaign=hrl_protein&nt_source_entry=whey-vs-pea-vs-collagen-which-protein-powder-should-you-buy&nt_source_pillar=protein) - [Classic Collagen](https://nutritailor.co.uk/products/classic-collagen?utm_source=hrl&utm_medium=ai_referral&utm_campaign=hrl_protein&nt_source_entry=whey-vs-pea-vs-collagen-which-protein-powder-should-you-buy&nt_source_pillar=protein) ## More from the Health Reference Library - [More on protein](https://nutritailor.co.uk/apps/learn/topic/protein) - [Browse the full library](https://nutritailor.co.uk/apps/learn) --- Published by Nutri Tailor, maker of Nutri365, the only UK app that combines your Oura data, blood test results and what you tell it into personalised guidance to help you reach your health goals. Details: https://nutritailor.co.uk/apps/learn/nutri365