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A form of vitamin D commonly extracted from lanolin (sheep wool) or lichen.

Most D3 is lanolin-derived; vegan/lichen-derived alternatives exist.

An amino sugar used as a joint-health supplement.

The vast majority is extracted from shellfish (shrimp/crab). Whether shellfish counts as halal is a known fiqh divergence; vegetarian (Aspergillus-fermented) versions exist.