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Taking certain medications may also inhibit B12 absorption in seniors

Even with adequate dietary intake of vitamin B12, poor absorption in the gut can still lead to vitamin B12 deficiency. Taking vitamin B12 as an oral supplement is largely a waste of money

Its a dosage calculator for peptides, this one will also work for Retatrutide but its a bit more generalised

Investigation of the peptide AOD9604 in an ovine osteochondral defect model

Supplementation aside, you should always aim to get the majority of your nutrients from food sources, but when it comes to vitamin B12, that's definitely easier said than done, especially for those following plant-based diets free of all animal products