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Formulation factors beyond concentration significantly impact efficacy

A vitamin shot delivers one vitamin into the muscle and does NOT provide hydration

doi: 10.1007/s10517-006-0365-z

By month 6, results were at their strongest (5272 hairs)

While no significant effects were observed on movement or number of egg clusters, there was a significant decrease in growth when snails were exposed to microplastics or the combination of microplastics and ibuprofen (p = 0.021)

However, if you happen to be choosing between the two, GHK-Cu is usually the better option since it helps the body use copper in a way that supports healthy skin, even being compared to Matrixyl Does GHK Combine with Copper Ions Naturally