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Shandong University of Traditional Chinese Medicine

Increased IGF mRNA in human skeletal muscle after creatine supplementation

50 Because API and FDF manufacturers already have access to cheaper established sources in China, they have little market incentive to make the capital investments required to build this infrastructure

Retatrutide is still investigational and not approved by any regulator as of April 2026, so everything below is presented as clinical-trial data, not as medical guidance

Active ingredient: tirzepatide Inactive ingredients (single-dose pens and vials): Sodium chloride Sodium phosphate dibasic heptahydrate Water for injection Hydrochloric acid and/or sodium hydroxide (added to adjust pH) Additional inactive ingredients (KwikPen and multi-dose vial only): Benzyl alcohol Glycerin Phenol What strengths are Zepbound pens