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The peptide is what your body already makes

Injections are appropriate only for vegans with confirmed deficiency or documented absorption problems.

[1] [11] Reevaluation at three- to six-month intervals allows clinicians to ascertain whether the dose can be reduced or the injection interval extended, reflecting current endocrine guidelines that emphasize the lowest effective estrogen exposure and periodic attempts at cessation once symptoms abate
This is especially the case after the loading period is finished, to help determine the right frequency thereafter