The most important things to consider when deciding which Vitamin C serum is best for you include your individual skin concerns and your level of sensitivity or tolerance for high-potency actives like Retinol, Glycolic Acid and Ascorbic Acid, the pure form of Vitamin C
AC has received consulting or speaker fees from Bristol Meyer Squibb, AstraZeneca, Boehringer Ingelheim, Eli Lilly, Merck Sharp & Dohme, Novartis, Novo-Nordisk, Sanofi-Aventis, Sigma-Tau, Takeda
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Consider the timing of your injection
If you see more than a tiny drop after injection, or if you are not sure the pen completed the dose, do not guess or redose on your own