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In the last two decades, compounding found new life with the boom in testosterone for men, hormone-replacement therapy for women, and, more recently, GLP-1 weight-loss drugs

The Pernicious Anaemia Society and the NIH B12 professional fact sheet are both reliable places to read further

Researchers using proper aseptic technique (alcohol swab, needle change between drawing and injection, single-use syringes) report near-zero contamination

Together these data indicate that D-Nle-Tyr-Ile-NH(CH 2 ) 5 CONH 2 is more metabolically stable than Norleual, possesses an elongated half-life in the circulation and penetrates tissue effectively