A 2018 Clean Label Project study tested 134 protein powder products and found that 75% tested positive for heavy metals, 55% tested positive for BPA, and many contained significantly less protein than labelled.
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Coeheal Editorial Team
Coeheal Editorial Team
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Coeheal Editorial Team
Editorially reviewed for accuracy against cited sources. This is an editorial review, not a medical or clinical review. For personalised health advice, consult a qualified healthcare professional.
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This article is for educational purposes only and does not constitute medical advice. Always consult a qualified healthcare professional before making health decisions. Our editorial standards →
Do You Actually Need a Protein Powder? Protein requirements: sedentary adults 0.8 g/kg/day; active adults and resistance trainers 1.6-2.2 g/kg/day; older adults (65+) 1.2-1.6 g/kg/day. A 70 kg active adult needs 112-154 g/day - achievable through whole foods. Protein powders are most useful when: whole food protein intake is genuinely insufficient (common in vegans, older adults, poor appetites); post-workout protein timing is a priority; or convenience is a limiting factor.
Whey is derived from milk (the liquid byproduct of cheese production). It has the highest leucine content of any protein source (approximately 10-11% by weight). Leucine is the primary trigger for muscle protein synthesis via the mTOR pathway. Whey also has the highest biological value (BV) and PDCAAS of any common protein source. Whey concentrate: 70-80% protein; contains lactose and some fat; most affordable. Whey isolate: 90%+ protein; most lactose and fat removed; better tolerated by lactose-sensitive people; more expensive. Whey hydrolysate: pre-digested; fastest absorption; most expensive; minimal advantage over isolate for most people.
A 2015 RCT found rice protein isolate produced equivalent gains in muscle mass and strength to whey when matched for leucine content and total protein dose. A 2019 RCT found pea protein produced similar muscle thickness gains to whey in young men doing resistance training. Plant proteins match whey when: the dose is sufficient (25-40 g per serving); amino acid profiles are complemented (pea + rice provides a complete profile comparable to whey); leucine is matched. Best plant proteins: pea protein isolate (best-evidenced, high BCAAs, good digestibility, hypoallergenic); rice protein isolate (high BCAAs, hypoallergenic, best combined with pea); hemp protein (complete amino acid profile, lower protein content, contains omega-3); soy protein isolate (complete profile, high leucine, most studied plant protein). Avoid collagen protein as a primary protein supplement - it lacks tryptophan and is not effective for muscle protein synthesis.
The 2018 Clean Label Project study of 134 protein powders found: 75% tested positive for lead; 55% tested positive for BPA; plant-based proteins had significantly higher heavy metal levels than whey (particularly lead, cadmium, arsenic); chocolate-flavoured products had higher heavy metal levels. Third-party certifications: NSF Certified for Sport (tests 270+ banned substances, heavy metals, label accuracy); Informed Sport (similar rigour); BSCG (Banned Substances Control Group); ConsumerLab.com. Protein spiking: some manufacturers add cheap amino acids (glycine, taurine, creatine) to artificially inflate nitrogen content. Look for brands using PDCAAS or DIAAS testing.
Additives worth avoiding: sucralose, acesulfame potassium (Ace-K), and aspartame (may disrupt gut microbiome; stevia and monk fruit are better alternatives); artificial colours (Red 40, Blue 1); carrageenan (gut inflammation); titanium dioxide (possible carcinogen, banned in EU food products); hydrogenated oils; high fructose corn syrup. Practical checklist: third-party tested (NSF, Informed Sport, or BSCG); 20-30 g protein per serving; leucine content disclosed; short ingredient list; no artificial colours or titanium dioxide; heavy metal testing results available. Reliable brands: Thorne Whey Protein (NSF Certified for Sport, grass-fed whey); Garden of Life Sport Organic Plant-Based Protein (NSF Certified for Sport, organic pea+rice blend); Momentous Essential Protein (NSF Certified for Sport, whey isolate); Naked Whey (minimal ingredients, no additives); Orgain Organic Protein (plant-based, relatively clean label).
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