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AHK-Cu emerged later as researchers explored variations on the original copper-binding tripeptide structure, swapping the glycine residue for alanine to see how the change affected biological activity
The first three in this series, if you missed them, were: The Symptoms of Vitamin B12 Deficiency The Optimal Vitamin B12 Dosage for Adults Healthiest Food Sources of Vitamin B12 Check out my new video series on vitamin B12: How Long Does It Take to Become Vitamin B12 Deficient and What Are the Symptoms
+ B12 injections suit vegetarians and vegans who do not eat animal foods, patients with confirmed absorption issues such as pernicious anaemia, coeliac disease or significant IBS, older adults whose stomach acid has dropped with age, and patients on long-term metformin or proton-pump inhibitors that lower B12 absorption
This may be relevant to some people following a vegan or very restricted diet, but diet should not be assumed to be the cause without considering symptoms, medicines, surgery and other risk factors