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A recent human study presented at the Endocrine Society meeting found that obese men treated with GLP1 receptor agonists, including semaglutide, dulaglutide or tirzepatide, experienced a rise in normal testosterone levels from 53 percent to 77 percent over 18 months (closely correlated with weight loss), demonstrating how peptide-based therapies can effectively support and restore healthy testosterone production

They may be able to point you to info about after effects of B12 jabs

doi:10.1093/ajcn/87.2.362

To obtain additional available information, contact FDA

Therefore, improving penetration efficiency is essential for achieving maximum efficacy

Please, if you feel strongly on this issue, ask your MP to get involved