Vitamin C: In those predisposed to kidney stones, vitamin C at high doses increases the risk of them.
The key message is that for most of the population, it's best to get these vitamins and minerals from the diet, from foods. That's where they're best absorbed, and they're in the optimal biological ratios.
But just a few years later, she found herself reversing course, after rigorous clinical trials found neither vitamin E nor folic acid supplements did anything to protect the heart. Even worse, studies linked high-dose vitamin E to a higher risk of heart failure, prostate cancer and death from any cause.
For example, vitamin C supplementation alone does not appear to be beneficial, and vitamin C combined with vitamin E from 12-18 weeks’ gestation has been shown to increase risk of foetal loss or perinatal death.
In addition vitamin A is a teratogen, with high intake during pregnancy being associated with increased risk of congenital malformations.
They concluded that while folic acid and iodine are recommended for routine supplementation in order to reduce risk of developing major congenital malformations and support foetal neurodevelopment, supplementation of other vitamins and minerals is largely dependent on a woman’s abilities to meet recommended dietary intakes.
We at the VitaminCFoundation.org believe that it is terrible advice to tell a pregnant women that vitamin C isn't necessary on such flimsy evidence. . This report based on "meta studies" and of course there are few or none w/respect to vitamin C and pregnancy. The vitamin A studies are tainted, in our opinion, to scare the public away from a simple vitamin that is more effective for soft cancers than chemotherapy.
Linus Pauling,informed us that nothing is more important for a pregnant woman than to be getting as much vitamin C as if she was able to make it herself (but for the damaged GULO gene). My wife started at 10 g daily before conception and through lactation. . Easy pregnancy. Our son had one childhood disease - chicken pox for one day, one pox. As reported by members of our forum, if you want your child healthy, happy and strong - supplement vitamin C before conception - through pregnancy, then lactation and into childhood.
The vitamin A scare is also a lie, and the truth is the opposite. Birth defects can be reliably induced in animal models by restricting vitamin A. Vitamin A is vital to avoid birth defects. For the real story on vitamin A we recommend Roger J. Williams THE WONDERFUL WORLD WITHIN YOU (available online for free)
https://riordanclinic.org/wp-content/up ... in_You.pdf
There's even more evidence to suggest most popular vitamin supplements are essentially useless
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Study finds most popular vitamin, mineral supplements provide no health benefit
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