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If you have no real concern for dark spots, or are new to Vitamin C, start with a Vitamin C serum with a lower concentration or one which is formulated with a Vitamin C derivative like Sodium Ascorbyl Phosphate

[1] In the first step of this pathway, H 2 O 2 is reduced to water by ascorbate peroxidase (APX) using ascorbate (ASC) as the electron donor

The variance of half a unit at these concentrations is clinically insignificant, amounting to roughly 0.017 mg difference

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Consistent Daily Use: This is a daily foundational supplement designed for ongoing use rather than intermittent dosing, supporting long-term immune and cellular health over time