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A sulfur-containing amino acid used in supplements and dough conditioners.

Historically derived from human hair or duck feathers; modern microbial-fermentation versions 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.