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Hormone testing may also be recommended, particularly for patients over 40 or those with symptoms suggesting hormonal imbalance

Then insert the needle into the center of the muscle and inject slowly

The safety concerns center on the potential for immune reactions to peptides, the possibility that "your immune system wants to go a little bit haywire when you start injecting things," as peptide practitioner James LaValle, who is scheduled to testify during the meeting, told Business Insider

They target aging through entirely different mechanisms, which means the comparison matters more for sequencing and stacking than for choosing one over the other