Vitamins — Revision Notes

⚡ 30-Second Revision

Fat-Soluble:

- A (Retinol): Vision, growth. Def: Night blindness, xerophthalmia. - D (Calciferol): Ca/P metabolism. Def: Rickets, osteomalacia. - E (Tocopherol): Antioxidant. Def: Hemolytic anemia, neurological. - K (Phylloquinone): Blood clotting. Def: Hemorrhage.

Water-Soluble:

- B1 (Thiamine): Carb metabolism. Def: Beriberi. - B2 (Riboflavin): FAD/FMN. Def: Cheilosis, glossitis. - B3 (Niacin): NAD/NADP. Def: Pellagra (3 Ds). - B5 (Pantothenic Acid): Coenzyme A.

Def: Rare. - B6 (Pyridoxine): Amino acid metabolism. Def: Microcytic anemia. - B7 (Biotin): Carboxylase coenzyme. Def: Rare. - B9 (Folic Acid): DNA synthesis. Def: Megaloblastic anemia, neural tube defects.

- B12 (Cobalamin): DNA, RBCs (contains Co). Def: Pernicious anemia. Req: Intrinsic Factor. - C (Ascorbic Acid): Collagen, antioxidant. Def: Scurvy.

2-Minute Revision

Vitamins are essential organic micronutrients, classified by solubility: fat-soluble (A, D, E, K) and water-soluble (B-complex, C). Fat-soluble vitamins are stored in the body, posing a risk of toxicity with excess, while water-soluble ones are excreted, requiring regular intake.

Key fat-soluble vitamins include Vitamin A (Retinol) for vision, D (Calciferol) for bone health, E (Tocopherol) as an antioxidant, and K (Phylloquinone) for blood clotting. Their deficiencies cause night blindness, rickets, neurological issues, and hemorrhage, respectively.

Water-soluble B-complex vitamins act as coenzymes in metabolism: B1 (Thiamine) for carbohydrates (deficiency: Beriberi), B2 (Riboflavin) for redox reactions (deficiency: Ariboflavinosis), B3 (Niacin) for NAD/NADP (deficiency: Pellagra), B5 (Pantothenic acid) for Coenzyme A, B6 (Pyridoxine) for amino acid metabolism, B7 (Biotin) for carboxylases, B9 (Folic acid) for DNA synthesis (deficiency: Megaloblastic anemia), and B12 (Cobalamin) for RBCs and DNA (deficiency: Pernicious anemia, unique for cobalt and intrinsic factor requirement).

Vitamin C (Ascorbic acid) is vital for collagen synthesis and is a potent antioxidant (deficiency: Scurvy). Focus on chemical names, main functions, and deficiency diseases for NEET.

5-Minute Revision

Vitamins are crucial organic compounds required in small amounts for various metabolic processes, growth, and overall health. They are categorized into two main groups based on their solubility: fat-soluble and water-soluble.

Fat-Soluble Vitamins (A, D, E, K): These are absorbed with dietary fats, stored in the liver and adipose tissue, and can accumulate to toxic levels.

Vitamin A (Retinol): — Essential for vision (component of rhodopsin), cell differentiation, and immune function. Deficiency causes night blindness and xerophthalmia. Sources: liver, carrots, leafy greens.
Vitamin D (Calciferol): — Regulates calcium and phosphate metabolism, crucial for bone health. Deficiency leads to rickets (children) and osteomalacia (adults). Sources: sunlight, fatty fish, fortified milk.
Vitamin E (Tocopherol): — A powerful lipid-soluble antioxidant, protecting cell membranes. Deficiency is rare but can cause neurological symptoms. Sources: vegetable oils, nuts.
Vitamin K (Phylloquinone): — Vital for blood coagulation by synthesizing clotting factors. Deficiency results in impaired clotting and hemorrhage. Sources: leafy green vegetables, gut bacteria.

Water-Soluble Vitamins (B-complex and C): These are not stored significantly and are readily excreted, requiring regular intake. Toxicity is rare.

B-Complex Vitamins: — Primarily function as coenzymes in energy metabolism.

* B1 (Thiamine): Coenzyme in carbohydrate metabolism (TPP). Deficiency: Beriberi. Sources: whole grains, pork. * B2 (Riboflavin): Precursor to FAD and FMN (redox reactions). Deficiency: Ariboflavinosis (cheilosis, glossitis).

Sources: milk, eggs. * B3 (Niacin): Precursor to NAD$^+$ and NADP$^+$ (redox reactions). Deficiency: Pellagra (Dermatitis, Diarrhea, Dementia). Sources: meat, grains, tryptophan. * B5 (Pantothenic Acid): Component of Coenzyme A.

Widespread in foods. * B6 (Pyridoxine): Coenzyme (PLP) in amino acid metabolism. Deficiency: Microcytic anemia, neurological issues. Sources: meat, bananas. * B7 (Biotin): Coenzyme for carboxylases (fatty acid synthesis, gluconeogenesis).

Sources: egg yolk, gut bacteria. * B9 (Folic Acid/Folate): Essential for DNA synthesis and cell division. Deficiency: Megaloblastic anemia, neural tube defects. Sources: leafy greens, legumes. * B12 (Cobalamin): Contains cobalt, essential for DNA synthesis and RBC formation.

Requires intrinsic factor for absorption. Deficiency: Pernicious anemia, neurological damage. Sources: animal products only.

Vitamin C (Ascorbic Acid): — Potent antioxidant, crucial for collagen synthesis, iron absorption. Deficiency: Scurvy. Sources: citrus fruits, bell peppers.

For NEET, memorize chemical names, key functions (especially coenzyme forms), major sources, and specific deficiency diseases for each vitamin. Understand the implications of fat-soluble vs. water-soluble classification.

Prelims Revision Notes

NEET Revision Notes: Vitamins

I. Classification based on Solubility:

Fat-Soluble Vitamins: — A, D, E, K

* Absorbed with fats, stored in liver/adipose tissue. * Can accumulate to toxic levels (hypervitaminosis). * Not readily excreted in urine.

Water-Soluble Vitamins: — B-complex (B1, B2, B3, B5, B6, B7, B9, B12), C

* Absorbed directly into blood, not stored significantly. * Readily excreted in urine; regular intake needed. * Low risk of toxicity.

II. Individual Vitamins: Chemical Names, Sources, Functions, Deficiency Diseases

Vitamin	Chemical Name	Major Sources	Key Functions	Deficiency Disease(s)
A	Retinol	Carrots, leafy greens ($\beta$-carotene), liver, eggs	Vision (rhodopsin), cell differentiation, immune function	Night blindness, Xerophthalmia, Keratomalacia
D	Calciferol (Cholecalciferol, Ergocalciferol)	Sunlight, fatty fish, fortified milk	Calcium & phosphate homeostasis, bone mineralization	Rickets (children), Osteomalacia (adults)
E	Tocopherols	Vegetable oils, nuts, seeds, leafy greens	Antioxidant (protects cell membranes)	Hemolytic anemia (infants), neurological problems
K	Phylloquinone, Menaquinone	Leafy greens, gut bacteria, liver	Blood clotting (synthesis of clotting factors II, VII, IX, X)	Impaired blood clotting, Hemorrhage
B1	Thiamine	Whole grains, legumes, pork	Coenzyme (TPP) in carbohydrate metabolism	Beriberi (wet/dry), Wernicke-Korsakoff syndrome
B2	Riboflavin	Milk, eggs, liver, leafy greens	Precursor to FAD & FMN (redox reactions)	Ariboflavinosis (cheilosis, glossitis, dermatitis)
B3	Niacin (Nicotinic acid, Nicotinamide)	Meat, poultry, fish, whole grains, tryptophan	Precursor to NAD$^+$ & NADP$^+$ (redox reactions)	Pellagra (Dermatitis, Diarrhea, Dementia)
B5	Pantothenic Acid	Widespread (meat, vegetables, grains)	Component of Coenzyme A (fatty acid metabolism, Krebs cycle)	Rare ('burning feet syndrome')
B6	Pyridoxine	Meat, fish, poultry, potatoes, bananas	Coenzyme (PLP) in amino acid metabolism, neurotransmitter synthesis	Microcytic anemia, neurological symptoms, dermatitis
B7	Biotin	Egg yolk, liver, nuts, gut bacteria	Coenzyme for carboxylase enzymes (fatty acid synthesis, gluconeogenesis)	Rare (dermatitis, hair loss)
B9	Folic Acid (Folate)	Leafy greens, legumes, liver, fortified cereals	DNA synthesis & repair, cell division, RBC formation	Megaloblastic anemia, Neural tube defects (pregnancy)
B12	Cobalamin	Animal products only (meat, fish, dairy, eggs)	DNA synthesis, RBC formation, neurological function (contains Cobalt)	Pernicious anemia, neurological damage (requires Intrinsic Factor)
C	Ascorbic Acid	Citrus fruits, berries, bell peppers	Antioxidant, collagen synthesis, iron absorption, immune function	Scurvy (bleeding gums, poor wound healing)

III. Key Concepts to Remember:

Provitamin: — Precursor to a vitamin (e.g., $\beta$-carotene to Vitamin A).
Coenzyme: — Organic molecule (often vitamin-derived) assisting enzyme function.
Antioxidants: — Vitamins C and E protect against free radical damage.
Intrinsic Factor: — Essential for Vitamin B12 absorption.

Vyyuha Quick Recall

To remember the fat-soluble vitamins: A D E K

Think: All Donkeys Eat Kiwi.

For B-complex vitamins and their deficiency diseases, a common one is: Thirsty Rats Never Pause Perfectly Because Food Can't Be Missed.

Thirsty (Thiamine - B1) $\rightarrow$ Beriberi
Rats (Riboflavin - B2) $\rightarrow$ Ariboflavinosis
Never (Niacin - B3) $\rightarrow$ Pellagra
Pause (Pantothenic Acid - B5) $\rightarrow$ Rare
Perfectly (Pyridoxine - B6) $\rightarrow$ Microcytic Anemia
Because (Biotin - B7) $\rightarrow$ Rare
Food (Folic Acid - B9) $\rightarrow$ Megaloblastic Anemia
Can't (Cobalamin - B12) $\rightarrow$ Pernicious Anemia
Be Missed (Vitamin C - Ascorbic Acid) $\rightarrow$ Scurvy