Vitamin A
Involved in vision, immune function and cell processes.
Vitamins
Vitamins are nutrients. Supplements are products.
Vitamins are essential nutrients involved in many biological processes. Vitamin supplements can provide vitamins in concentrated forms, but the product label matters.
Compare the amount per recommended serving, the form used, the other ingredients and the warnings, and remember that more of a nutrient is not automatically better.
Common vitamins
Vitamin B complex
A group of B vitamins with distinct roles.
Vitamin B12
Relevant for people with limited dietary sources.
Vitamin C
Water soluble and found in many fruits and vegetables.
Vitamin D
Intake can depend on diet, sunlight and life stage.
Vitamin E
Fat soluble and present in oils, nuts and seeds.
Vitamin K
Involved in normal blood clotting.
Multivitamins
Combination products where the label detail matters.
What each vitamin page covers
- What the vitamin is
- What it does in the body
- Food sources
- Supplement forms
- What the label tells you
- Relevant safety considerations
- Authorised health claims where relevant
- What Sláinte evaluates
Do not assume more is better
More of a nutrient is not automatically better.
The appropriate intake depends on the nutrient, individual circumstances and total intake from food and supplements.
Compare products
Sláinte can help compare vitamin products by amount per recommended serving, formulation, ingredient list and other relevant information.
Sources
Last reviewed: August 2026