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The second component is a copper ion that binds to this peptide chain

Fletcher MM, et al

Normal and expected reactions include a brief stinging or burning sensation during or immediately after injection, mild redness or warmth at the injection site lasting a few minutes, and small temporary lumps that resolve within 30 to 60 minutes as the solution disperses through subcutaneous tissue

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Proper technique reduces frequency, but occasional bruises are normal

For example, the authors of a 2018 study state that they have an excellent safety record.3 When it comes to our individual product recommendations, the chart below breaks down some important safety details about each