Your Cart is Empty
But it doesn't have to be.
Continue Shopping.
Added to Cart
Cart Total:
Customers Also Bought:

iHerb Customer Reviews



Savings of: $2.59 (20% off)

Write a Review

Sorry, this product is no longer in stock.

Reviews | English
Sort By

Caution for hypothyroid, low blood sugar and immune dysfunction - B1 is an iodine, magnesium and manganese antagonist

Posted by Health-Is-Wealth on Feb 19, 2014

Vitamin B1 - iodine, magnesium, manganese, copper and silica antagonist (among others) - all in some way essential for thyroid/endocrine/collagen health. High doses of B1 can therefore lead to: immune dysfunction, hypothyroidism if iodine intake is inadequate; hypothyroid/low blood sugar/migraine-headaches if manganese intake is inadequate - especially when combined with higher intakes of other less-obvious iodine/manganese antagonists such as niacin, B6, magnesium, calcium, vit C, boron, etc. Additionally, B1 is an essential cofactor for transketolase - suggest caution for people who take medications that also upregulate transketolase (e.g. asthma steroids), because more B1 may lead to depletion of other co-factors and essential nutrients (e.g. EFA's), creating a nasty catch-22 situation. B1 is also mildly anticholinergic - something to be mindful of, because for some people that can be an issue. High intake of B1 is also likely to cause/contribute to bad armpit BO. The plus side - the caps are easy to open up in order to sprinkle a trace on food. If this review was helpful to you, please click YES below - thank you. For reviews of all the products I have purchased from iHerb, please click my username above.

Verified Purchase

Was this review helpful to you?


Posted by Reviewer2060864 on Jan 11, 2012

one time when I use this product, I can feel the instant absorption in my difficient/depressed brain. I can feel the calming effect almost immediatly.

Verified Purchase

Was this review helpful to you?

Bugs Beware

Posted by maria-and-xenios on Oct 20, 2013

During the spring-summer-autumn months, I depend on B1 to keep mosquitos, chiggers, and fleas at bay. One in the morning and one at night keep the bugs away.

Verified Purchase

Was this review helpful to you?

Items 1-3 of 3 total