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Although, if one considers consuming them, following the dosage according to the doctor's recommendation is most favourable

Deficiency after gastric banding is therefore primarily related to: Reduced dietary intake and food tolerance , limiting consumption of B12-rich foods Use of acid-suppressing medicines (PPIs or H2RAs) , which can impair the release of B12 from food proteins and reduce absorption of food-bound B12 Crystalline B12 the form found in supplements and fortified foods does not require acid or pepsin for release

This enabled commercial use even without full drug approval

So the "vs" here is really a comparison between a fat-cell-targeting fragment and gut-hormone-mimicking peptides

According to research published in the journal Bioactive Materials , GHK-Cu is considered one of the most potent promoters of nourishing hair growth