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Quick answer: Recombinant Bovine Somatotropin carries the heavier risk profile. Zinc pyrithione is banned in the EU and allowed in the US; Recombinant Bovine Somatotropin is — in the EU and — in the US.
| Property | Zinc pyrithione | Recombinant Bovine Somatotropin |
|---|---|---|
| EU status | Banned | — |
| US status | Allowed | — |
| Risk level | medium | — |
| Banned in | European Union | European Union, Canada, Japan, Australia, New Zealand |
| Restricted in | — | — |
| Category | cmr | additive |
| Where it hides | anti-dandruff shampoo, anti-acne products | — |
Zinc pyrithione is an antifungal and antibacterial active in dandruff shampoos.
Recombinant bovine somatotropin (rBST) is the synthetic version of bovine growth hormone (BST), naturally produced by the pituitary gland in cattle. The recombinant version is produced using genetically engineered bacteria and is injected into dairy cows to increase milk production by 10-15%. Brand name: Posilac.
Zinc pyrithione: Reclassified as a reproductive toxicant in the EU and banned as a cosmetic preservative in 2022; still a key US OTC dandruff active.
Recombinant Bovine Somatotropin: See recombinant-bovine-growth-hormone-rbgh for full detail. Key concerns: rBST elevates IGF-1 in milk; elevated blood IGF-1 is associated with breast, prostate, and colorectal cancer risk in epidemiological studies. Animal welfare: increased mastitis (up to 25-50% higher rates), lameness, and antibiotic use. The Codex Alimentarius Commission declined to endorse rBST safety MRLs in a historic 33-29 vote. Health Canada rejected rBST approval in 1999 after finding it caused significant animal health problems requiring increased antibiotic use.
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