Vitamins are organic molecules (or a set of closely related molecules called vitamers) that are essential to an organism in small quantities for proper metabolic function. These essential …

Vitamins and minerals are micronutrients required by the body to carry out a range of normal functions. However, these micronutrients are not produced in our

Learn more about Vitamin A uses, effectiveness, possible side effects, interactions, dosage, user ratings and products that contain Vitamin A.

Nov 22, 2025 · Vitamin, any of several organic substances that are necessary in small quantities for normal health and growth in higher forms of animal life. Vitamins generally cannot be …

Jul 17, 2024 · Vitamins are substances that your body needs to grow and develop normally. There are 13 vitamins your body needs; Each has specific jobs.

Vitamin A is important for eyesight and immunity. Learn how much you need, good sources, deficiency symptoms, and health effects here.

Apr 17, 2025 · Vitamin A. Office of Dietary Supplements. https://ods.od.nih.gov/factsheets/VitaminA-HealthProfessional/. Accessed March 4, 2025. …

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Dec 19, 2025 · B vitamins are essential for health, supporting energy production, DNA synthesis, and blood cell formation.

Vitamin A is a generic term that encompasses a number of related compounds (Figure 1). Retinol and retinyl esters are often referred to as preformed vitamin A. Retinol can be converted by …