Can vitamins increase risk of cancer ?


Vitamins are absolutely essential nutrients and vitamin deficiency causes various illness.

But a high dose of vitamin, far too much than needed by the body, is also bad.

Everything in moderation is good. Even an abundance of a good thing is bad.

It is similar to food. Lack of food would cause starvation and even death in the extreme. But too much of food causes obesity and other health problems. Same principle applies to vitamins.

A Cochrane review looked at the ability of vitamins to prevent lung cancer. The review concluded that there is “no beneficial effect of supplements for the prevention of lung cancer and lung cancer mortality in healthy people”

Worryingly, the review also found that the following:

Vitamin A supplements increase lung cancer incidence and mortality in smokers or persons exposed to asbestos”.

Vitamin C increases lung cancer incidence in women.

Vitamin E increases the risk of haemorrhagic strokes.

So if you are having a healthy balanced diet, be careful with vitamin supplements.

Drugs for preventing lung cancer in healthy people
Marcela Cortés-Jofré et al. Cochrane Database Syst Rev. 2020.
Free PMC article

Disclaimer: Please note- This blog is NOT medical advice. This blog is NOT a expert medical opinion on various topics. This blog is purely for information only and do check the sources where cited. Please DO consult your own doctor to discuss concerns and options relevant to you. The views expressed in this blog represent the author’s views held at the time of drafting the blog and may change overtime, particularly when new evidence comes to light. The blog is not previewed, commissioned or otherwise endorsed by any organisation that the author is associated with. The views expressed in this blog are not, in way whatsoever, intended to be a substitute for professional advice.