# A query about supplemental vitamins

**URL:** <https://boards.straightdope.com/t/a-query-about-supplemental-vitamins/794945>\
**Category:** Factual Questions\
**Created:** [August 28, 2017, 4:17pm UTC](https://boards.straightdope.com/t/a-query-about-supplemental-vitamins/794945 "2017-08-28T16:17:48Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![2Bits](https://avatars.discourse-cdn.com/v4/letter/2/e95f7d/32.png) [@2Bits](https://boards.straightdope.com/u/2Bits)\
**Post date:** [August 28, 2017, 4:17pm UTC](https://boards.straightdope.com/t/a-query-about-supplemental-vitamins/794945/1 "2017-08-28T16:17:48Z")

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Inspired by this article about vitamins B6 & B12:

> **[Energy-Promising Vitamins Appear to Be Causing Lung Cancer](https://www.theatlantic.com/health/archive/2017/08/b12-energy/537654/?utm_source=fbb)**
>
> Alarming new evidence of a three-fold increase in cases among people who take high-dose B6 and B12

…is there conclusive evidence that consuming _any_ vitamin in excess of what our bodies require to maintain a basic level of health has any benefit(s)?

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**Author:** ![kayaker](https://sea3.discourse-cdn.com/straightdope/user_avatar/boards.straightdope.com/kayaker/32/441_2.png) [@kayaker](https://boards.straightdope.com/u/kayaker)\
**Post date:** [August 28, 2017, 5:03pm UTC](https://boards.straightdope.com/t/a-query-about-supplemental-vitamins/794945/2 "2017-08-28T17:03:12Z")

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There is evidence that ingestion of certain vitamins in excess of the RDA can encourage the occurrence or stimulate growth of certain cancers.

[Cite](https://www.consumerlab.com/answers/Is+it+true+that+some+vitamins+or+supplements+can+cause+cancer%3F/vitamins_supplements_cancer/)

[Cite](https://www.cancercouncil.com.au/22108/cancer-prevention/diet-exercise/nutrition-diet/fruit-vegetables/vitamins-and-cancer/)

[Cite](https://sciencebasedmedicine.org/vitamins-and-cancer-risk/)