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In addition to risk of vitamin B12, calcium, iron and magnesium malabsorption, there is evidence that acid suppression by PPIs increases risk of malabsorption of other important vitamins and minerals as well, including vitamin C, zinc and folic acid.[231- 235] Proton pump inhibitor therapy lowers the concentration of vitamin C in gastric juice and the proportion of the vitamin in its active antioxidant form i.e., ascorbic acid

First, the peptide sourcing question has not been resolved publicly

See tesamorelin vs ipamorelin for GH-related peptide storage comparisons

This is where the question How Long Does a Vitamin B12 Shot Last

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