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Description
However, an adequate amount of folate, vitamin B6, and vitamin B12 is required for the body to make the amino acid cysteine

On 7 April, the FDA published several warning letters, including a batch to companies that the agency said are marketing GLP-1 products, dual GLP-1/glucose-dependent insulinotropic polypeptide (GIP) products, and triple agonist (GLP-1/GIP/glucagon) products without regulatory approval

CrossRef Perioperative management of adult diabetic patients

This has led some to believe that oral supplementation is a waste of time

PMID 2572174