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Check out this paper from 1992: If the indiscriminate dumping of industrial cyanide waste continues unchecked with the inherent risk of pollution of food and water supplies there may well come a time when more widespread chronic cyanide neurotoxicity occurs in the Western hemisphere from a dietary source in persons with a genetic or acquired error of cyanide or vitamin B12 metabolism

Isidro-Llobet A, Kenworthy MN, Mukherjee S, Kopach ME, Wegner K, Gallou F, et al

GHK-Cu is not a drug, supplement, or food product, and is not for human consumption, veterinary use, or medical applications

Each batch is tested for GLA content, to ensure it meets the stated amount at expiry