Its is not recommended for healthy individuals to take vitamin supplements daily. Fat soluble vitamins can be stored in the body and excess intake of them can cause harm.
Vitamin D is a fat soluble vitamin (vitamin D2 ergocalciferol, vitamin D3 cholecalciferol) , synthesized in the body only on exposure to sunlight. There for people who have vitamin D deficient diet and poor exposure to sunlight tend to be vitamin D deficient. The exact role of vitamin D is unknown but it helps in developing immunity, regulating calcium levels and strengthening of bone and muscle.
British medical journal published a study done on eleven thousand people in 2017. It says people having vitamin D deficiency have more chance of developing respiratory tract infections. And the same people when treated with vitamin D supplements daily found to be less prone to respiratory tract infections and their immune system now works effectively.
Taking 250iu to 400iu of vitamin D daily is actually beneficial to health and it is highly unlikely that these doses can cause overdosing. However constant intake of therapeutic doses of vitamin D without the concern of a medical practitioner is dangerous and can lead to calcium deposition in soft tissues.
Vitamin C (ascorbic acid) is vital for the function of white blood cells that help to fight infections, and overall immune system health. Vitamin C is also important for iron absorption, and being deficient in iron can make you more vulnerable to infections.
The normal, recommended daily intake of vitamin C for adults from the diet is 60 to 120 mg. You can get about 80 to 90 mg from a cup of orange juice or sliced orange. And it is highly unlikely for someone eating food daily to develop vitamin C deficiency.
continues intake of higher doses of vitamin C can result in developing of kidney stones,
Zinc has become one of the most popular suggestions for reducing symptoms of COVID.
Some studies showed that zinc reduces the duration of a cold by half. Zinc gluconate can reduce the duration of common cold. But excess intake of zinc can result in zinc poisoning.
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