Thiamin Overdose, Toxic effects of excess intake

Toxicity is very rare as excess thiamin is excreted in the urine. Long-term excessive use can produce symptoms of hyperthyroidism: headache, irritability, trembling, rapid pulse and insomnia. With injected thiamin, reactions of itching, weakness, gastrointestinal bleeding, low blood pressure, pain, sweating, nausea, tingling and faintness can sometimes occur.

The lowest daily dose known to cause side effects is 5 mg, but many people can tolerate much larger doses.

Thiamin Categories:

Thiamin
Thiamin Health
Thiamin Absorption
Thiamin Deficiency
Thiamin Sources
Thiamin Recommended Daily
Thiamin Overdose
Thiamin Supplements
Thiamin Interactions

Other Vitamins:

Vitamin A
Carotenes
Beta carotene
Lycopene
Lutein
Thiamin
Riboflavin
Niacin
Vitamin B6
Folate
Vitamin B12
Biotin
Pantothenic acid
Vitamin C
Vitamin D
Vitamin E
Vitamin K