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Lack of it can cause mood disorders such as depression, weight gain, and reduced cognitive function

Agreed, and they will only test serum so will miss many people anyway

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However, potential side effects can include: Nausea or dizziness (rare) Headaches Injection site irritation Overstimulation or fatigue if overdosed There are no long-term human trials, so effects on hormones, organs, or chronic use remain unknown