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"If someone injects it under their skin, what are they getting?" FDA has worked to restrict peptides for years During the COVID-19 pandemic, the FDA issued over a half-dozen warning letters to businesses promoting peptides with "immune-boosting powers." Then in 2023, the agency added nearly 20 peptides to a list of substances that should not be compounded due to safety risks

Preclinical trials conducted on rats demonstrate measurable improvements in transected tendon reattachment and Achilles tendon rupture models, though human clinical data remain limited

Instead, it has been studied primarily for its potential role in regulating fat metabolism

Get the details in the Concerns and Cautions section of our Probiotics Supplements Review

Neither compound has FDA approval or a completed human efficacy trial, so any comparison should be read as mechanism-to-mechanism, not outcome-to-outcome

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