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However, the effectiveness of topical vitamin C depends heavily on the formulation's stability and ability to penetrate the skin. Products need to contain stabilized vitamin C derivatives like magnesium ascorbate or sodium ascorbyl phosphate to be truly effective. It generally takes about 8–10 weeks to notice visible improvements.
Can Oral Supplements Replace Topical Vitamin C?
While oral vitamin C supplements circulate throughout the body, only a tiny fraction reaches the skin directly. Topical applications are usually more effective for skin concerns because they deliver vitamin C straight to where it is needed. Therefore, if skin health and brightening are goals, topical application might be preferable.