Choose a syringe if you inject infrequently (weekly or less), if you use many different peptides and switching cartridges would be impractical, if cost is the primary concern and you have steady hands with good vision, or if your doses are large enough that syringe accuracy is adequate
The table below summarizes the headline distinctions: Neither is inherently "better" for every person
For female-specific peptide protocols, see my full breakdown of the best peptides for women
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Supplements simply provide an extra nudge especially with age stress poor sleep or inflammation