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The confusion comes from both being discussed in longevity medicine, not from any real similarity between them

If you use compounded semaglutide and are involved in the reconstitution process, knowing the correct bacteriostatic water ratio for 5mg semaglutide or the ratio for 10mg semaglutide matters for both efficacy and stability

The SURMOUNT-5 trial showed that maximum-dose tirzepatide produces about 47% more weight loss than maximum-dose semaglutide, so they are clearly not equivalent at their respective maximums