P1

Vitamin B1 is found in nuts, beans, and yeast. The body needs it to create energy. Vitamin B1 has been used to improve heart health and ease digestion. It has also been used to manage thiamine deficiency. It can be taken as a pill or powder. It can also be injected into the bloodstream or muscle by a healthcare provider.

Dosages

1 to 1.2 milligrams per day for adults

P5

May be effective

Unlikely to be effective

  • Glaucoma—unlikely to provide benefit C1

Not enough data to assess

Editorial process and description of evidence categories can be found at EBSCO NAT Editorial Process.

P6

It is likely safe to vitamin B1 in small doses for a short time. Not enough studies have been done to say whether it is safe to take for a long period.

Women who are pregnant or breastfeeding should not take high doses of vitamin B1.

Interactions

Talk to your doctor about any supplements or therapy you would like to use. Some can interfere with treatment or make conditions worse.