Vitamins are organic essential micronutrients (needed at minute levels) that cannot be synthesized by vertebrates but are required to perform specific biological functions for normal growth and the maintenance of a human’s health.

Vitamins are small organic molecules that are not synthesized endogenously in sufficient amounts which highlights their importance in our diet at all life stages, starting from neonatal to geriatric life. The influence of sex for each vitamin is also presented at each life stage to highlight the different daily requirements and effects.ĭespite its tiny molecular size, its physiological functions are indisputable. Herein, in this review, a deep insight into the orchestration of the four different fat-soluble vitamins requirements is presented for the first time across the human life cycle beginning from fertility, pregnancy, adulthood, and senility with an extensive assessment ofthe interactions among them and their underlying mechanistic actions. Fat-soluble vitamins were found to have an indisputable role in an array of physiological processes such as immune regulation, vision, bone and mental health. Nonetheless, the fat-soluble vitamins are now considered a prophylactic measurement for a multitude of diseases such as autism, rickets disease, gestational diabetes, and asthma. Vitamins are classified into water-soluble and fat-soluble components. The fat-soluble vitamins include vitamins (A, D, E, and K). The majority of previous studies have examined such issues that relates to a specific vitamin or life stage, with the majority merely reporting the effect of either excess or deficiency. Among these micronutrients are vitamins that are required in small amounts for optimum metabolism, homeostasis, and a healthy lifestyle, acting as coenzymes in several biochemical reactions.

Age and Gender are vital determinants for the micronutrient demands of normal indviduals.

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