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A collagen-like protein from fish swim bladders used to clarify some liquids.

Fish-derived; generally more acceptable than porcine but still requires disclosure.

A natural oil used as an emulsion adjuvant in some influenza vaccines (e.g., MF59) to boost immune response.

Historically purified from shark liver oil; plant-derived squalene exists but vaccine-grade supply is often animal/fish sourced — verify product insert.