Vitamins — everyday essentials, explained clearly
Vitamins are essential micronutrients the body needs in small amounts day-to-day. Some are water-soluble (e.g., vitamin C and the B-complex) and are not stored in large amounts, so a regular dietary supply is useful. Others are fat-soluble (A, D, E, K) and are used by the body alongside dietary fats. Because needs vary with diet and life stage, many people choose well-labelled food supplements to help cover daily requirements as part of a balanced lifestyle.
On our category pages and product labels, we use wording permitted in Great Britain. That’s why you’ll see phrases like “contributes to” and “maintenance of normal …” — these are the official, authorised functions for each vitamin.
When a vitamin supplement may be useful
- Periods of limited sunlight exposure (vitamin D)
- Dietary patterns excluding certain food groups (e.g., plant-based diets and vitamin B12-containing foods)
- Convenience and consistency: one-a-day formats help keep routines simple
Food supplements are not a substitute for a varied, balanced diet and a healthy lifestyle. Always follow on-pack directions.
Explore our vitamins — authorised functions at a glance
Vitamin D (cholecalciferol)
- Contributes to normal absorption and utilisation of calcium and phosphorus
- Contributes to normal blood calcium levels
- Contributes to the maintenance of normal bones, teeth and muscle function
- Contributes to the normal function of the immune system
- Has a role in the process of cell division
Label tip: You’ll see amounts expressed as µg and IU (e.g., 25 µg = 1000 IU).
Vitamin C (ascorbic acid)
- Contributes to normal immune function
- Contributes to normal collagen formation for the normal function of blood vessels, bones, cartilage, gums, skin and teeth
- Contributes to the protection of cells from oxidative stress
- Contributes to the reduction of tiredness and fatigue and to normal energy-yielding metabolism
- Contributes to normal functioning of the nervous system and normal psychological function
- Contributes to the regeneration of the reduced form of vitamin E and to increased iron absorption
Forms & sources: ascorbic acid from standard or fruit-derived sources (e.g., acerola); both can meet label claims when provided in suitable amounts.
Vitamin B12 (cobalamin) & the B-complex
Vitamin B12 contributes to:
- Normal energy-yielding metabolism and the reduction of tiredness and fatigue
- Normal functioning of the nervous system and normal psychological function
- Normal homocysteine metabolism
- Normal red blood cell formation and normal function of the immune system
- The process of cell division
Other B-vitamins (authorised examples):
- B1 (thiamin): normal heart function; normal nervous system; normal energy-yielding metabolism
- B2 (riboflavin): reduction of tiredness and fatigue; protection of cells from oxidative stress; maintenance of normal vision, skin and red blood cells
- B3 (niacin): normal psychological function; maintenance of normal skin and mucous membranes; reduction of tiredness and fatigue
- B5 (pantothenic acid): normal mental performance; reduction of tiredness and fatigue; normal synthesis and metabolism of steroid hormones, vitamin D and some neurotransmitters
- B6 (pyridoxine): regulation of hormonal activity; normal immune function; normal red blood cell formation; reduction of tiredness and fatigue
- Biotin: maintenance of normal hair and skin; normal macronutrient metabolism; normal nervous system function
- Folate (folic acid/5-MTHF): reduction of tiredness and fatigue; normal blood formation; normal homocysteine metabolism; maternal tissue growth during pregnancy (where products provide the qualifying amount as indicated on label); has a role in the process of cell division
Vitamins A & E
Vitamin A contributes to normal vision, maintenance of normal skin and mucous membranes, normal function of the immune system, normal iron metabolism and has a role in the process of cell specialisation.
Vitamin E contributes to the protection of cells from oxidative stress.
Vitamin K (including K2 MK-7)
- Contributes to normal blood clotting
- Contributes to the maintenance of normal bones
Forms: K1 (phylloquinone) and K2 (menaquinones such as MK-7). Product labels will state the form and amount per serving.
Choosing confidently
- Form & amount: check the vitamin form (e.g., D3, methylcobalamin, MK-7) and the per-capsule/tablet amount in relation to the product’s directions
- Suitability: look for vegan/vegetarian status where relevant
- Quality cues: UK-made and GMP references indicate robust manufacturing standards
- NRV context: labels may show %NRV (Nutrient Reference Value) to help you gauge per-serving amounts
We prioritise clarity and evidence. Each product page includes full ingredient lists, serving information and the authorised functions applicable to the vitamins provided. No hype — just transparent labelling and practical guidance.
Practical pointers
- Consistency: authorised functions are achieved in the context of the stated daily intake and a balanced diet
- Combinations: some vitamins appear together (e.g., D3 with K2, or B-complex) for convenient, once-daily routines
- Storage & care: follow on-pack advice (cool, dry place; keep out of reach of children)
- Who should seek advice: pregnant or breastfeeding individuals, those on medication or under medical supervision should consult a healthcare professional
If you’re unsure which vitamin suits your routine, contact us — we’re happy to help you read labels and understand authorised functions. Remember: supplements complement a balanced diet; they do not replace it.