https://www.organicconsumers.org/news/v ... c-vitamins
There is a growing school of nutritionists called orthomolecularists who argue that there is no difference between a "synthetic" and a "natural" vitamin molecule. According to this theory, biologically identical (bioidentical) molecules are indistinguishable from those synthesized by plants or animals.
As you'll soon see, the evidence shows that vitamin supplements can become toxic to the body in the following circumstances:
- if they're synthetically produced
- if taken in overly high unnatural dosages.
Poisonous vitamins
Up until recently, it has been commonly assumed that only fat soluble vitamins can potentially become toxic. Since fat soluble vitamins A, E, D, and K can be stored by the body and accumulate in overly high toxic levels when taken in large dosages, it has been recommended to be cautious with their intake, a recommendation which nevertheless has been ignored by vitamin manufacturers who keep selling formulas with high contents of fat soluble vitamins.
https://www.consumerlab.com/answers/can ... _toxicity/
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5241405/