Which vitamin can be synthesized in significant amounts by humans and,therefore,may not be essential?

Question

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Vitamin D can be synthesized in significant amounts by humans through exposure to sunlight, and therefore may not be essential in the diet. However, for individuals with limited sun exposure or certain medical conditions, vitamin D supplementation may be necessary. Vitamins E, K, retinoids, and carotenoids cannot be synthesized in sufficient amounts by humans, and therefore are considered essential nutrients that must be obtained through the diet.

Which Vitamin Can Be Synthesized in Significant Amounts by Humans