Brain

Vitamin C, biotin, thiamine (vitamin B1), riboflavin (vitamin B2), niacin (vitamin B3), vitamin B6, vitamin B12, copper, iodine contribute to normal functioning of the nervous system.
Vitamin C, Biotin, Thiamine (vitamin B1), Niacin (vitamin B3), Vitamin B6, Vitamin B12 contribute to normal psychological function.
Zinc and iodine contribute to normal cognitive function.
Pantothenic acid contributes to normal mental performance.

Cardiovascular system

Vitamin C contributes to normal collagen formation for the normal function of blood vessels.
Vitamin K contributes to normal blood clotting.
Riboflavin (vitamin B2) contributes to the maintenance of normal red blood cells.
Vitamin B6 & B12 contribute to normal red blood cell formation.
Thiamine (vitamin B1) contributes to the normal function of the heart.
Vitamin B6 and B12 contribute to normal homocysteine metabolism.
Vitamin D contributes to normal blood calcium levels.
Vitamin D contributes to normal absorption/utilisation of calcium and phosphorus.

Bones, muscles and teeth

Vitamin C contributes to normal collagen formation for the normal function of bones.
Vitamins D and K, zinc and manganese contribute to the maintenance of normal bones.
Vitamin D contributes to the maintenance of normal muscle function.
Vitamin C contributes to normal collagen formation for the normal function of teeth.
Vitamin D contributes to the maintenance of normal teeth.

Joint cartilage

Vitamin C contributes to normal collagen formation for the normal function of cartilage.

Eyesight

Vitamin A, riboflavin (vitamin B2) and zinc contribute to the maintenance of normal vision.
Zinc contributes to normal metabolism of vitamin A.

Immune system

Vitamin C, Vitamin D, Vitamin A, Vitamin B6, Vitamin B12, Zinc, Copper, Selenium contribute to the normal function of the immune system.

Endocrine system (hormones)

Pantothenic acid (vitamin B5) contributes to normal synthesis and metabolism of steroid hormones, vitamin D and some neurotransmitters.
Vitamin B6 contributes to the regulation of hormonal activity.
Iodine contributes to the normal production of thyroid hormones and normal thyroid function.
Selenium contributes to the normal thyroid function.

Integumentary System (Skin, hair and nails)

Vitamin C contributes to normal collagen formation for the normal function of skin.
Vitamin A, riboflavin (vitamin B2), niacin (vitamin B3), biotin (vitamin B7), zinc and iodine contribute to the maintenance of normal skin.
Copper contributes to normal skin pigmentation.
Biotin, zinc and selenium contribute to the maintenance of normal hair.
Copper contributes to normal hair pigmentation.
Zinc and selenium contribute to the maintenance of normal nails.

Reduction of tiredness and fatigue

Vitamin C, Riboflavin (vitamin B2), Niacin (vitamin B3), Pantothenic acid (vitamin B5), Vitamin B6, Vitamin B12 contribute to the reduction of tiredness and fatigue.

Iron absorption

Vitamin C increases iron absorption.
Copper contributes to normal iron transport in the body.
Vitamin A and riboflavin (vitamin B2) contribute to normal iron metabolism.

Fertility and reproduction

Zinc contributes to the maintenance of normal testosterone levels in the blood.
Selenium contributes to normal spermatogenesis.
Zinc contributes to normal fertility and reproduction.

Exercise

Vitamin C contributes to maintain the normal function of the immune system during and after intense physical exercise.

Gums

Vitamin C contributes to normal collagen formation for the normal function of gums.

Normal energy-yielding metabolism

Vitamin C, biotin (vitamin B7), thiamine (vitamin B1), riboflavin (vitamin B2), niacin (vitamin B3), pantothenic acid (vitamin B5), vitamin B6, vitamin B12, copper, manganese, iodine contribute to normal energy-yielding metabolism.

Metabolism

Chromium contributes to the maintenance of normal blood glucose levels.
Biotin, chromium and zinc contribute to normal macronutrient metabolism.
Zinc contributes to normal acid- base metabolism.
Zinc contributes to normal carbohydrate metabolism.
Zinc contributes to normal metabolism of fatty acids.
Vitamin B6 contributes to normal protein and glycogen metabolism.
Molybdenum contributes to normal sulphur amino acid metabolism.
Vitamin B6 contributes to normal cysteine synthesis.
Zinc contributes to normal protein synthesis.

Connective tissue

Copper contributes to maintenance of normal connective tissues.
Manganese contributes to the normal formation of connective tissue.

Maintenance of normal mucous membranes

Vitamin A, biotin, riboflavin (vitamin B2), niacin (vitamin B3) contributes to the maintenance of normal mucous membranes.

Cell division

Vitamin D, B12 and zinc have a role in the process of cell division.
Vitamin A has a role in the process of cell specialization.

DNA synthesis

Zinc contributes to normal DNA synthesis.

Protection of cells from oxidative stress

Vitamin C and E, riboflavin (vitamin B2), zinc, copper, manganese and selenium contribute to the protection of cells from oxidative stress.

Regeneration of the reduced form of vitamin E

Vitamin C contributes to the regeneration of the reduced form of vitamin E.