HealthWise Glucosamine HCL 150g Size:150g help support energy production and 234180 help support energy production and immune function A 97% naturally derived treatment for hair & scalp Harnesses no rinse micellar technology to instantly cleanse scalp Contains naturally derived styling polymers to revive second day styles Helps tame frizz for up to 72 hours However those with extreme allergy issues will always need to exercise caution and try in micro doses pending advice from their healthcare professional Shellfish allergies generally present as an allergic reaction to the flesh of shellfish and not the shells themselves