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Vitamin B1 (Thiamine) Lab Test & Other Interactions

Other Interactions with Vitamin B1 (thiamin)

Vitamin B1 (thiamin) has interactions with other substances as follows:

  • Alcohol
    People that drink excessive amounts of alcohol will have impaired vitamin B1 (thiamin) absorption due to the alcohol blocking its absorption and may be come deficient in this vitamin.
  • Caffeine in tea and coffee
    The caffeine in tea and coffee (as well as tea or coffee manufactured soft drinks) can block the absorption of vitamin B1 (thiamin) and possibly cause a deficiency. People who drink large amounts of tea, coffee or other caffeine-containing drinks should get their vitamin B1 (thiamin) levels checked to ensure they are not deficient.
  • Carbonated soft drinks
    Carbonated soft drinks and foods decrease the effectiveness of vitamin B1 (thiamin) from foods eaten and supplementation may be required.
  • Citrate food additives in food and drinks
    Citrate food additives which are often added to many manufactured soft drinks and foods decrease the effectiveness of vitamin B1 (thiamin) from foods eaten and supplementation may be required.
  • Sulphite food additives in food and drinks
    Sulphite food additives which are often added to many manufactured soft drinks and foods decrease the effectiveness of vitamin B1 (thiamin) from foods eaten and supplementation may be required.
The caffeine in tea and coffee (as well as tea or coffee manufactured soft drinks) can block the absorption of vitamin B1 (Thiamin) and possibly cause a deficiency

Vitamin B1 (thiamin)'s effect on lab tests

Vitamin B1 (thiamin) has an effect on the following blood tests:

  • Serum theophyline
    Vitamin B1 (thiamin) can interfere with blood test results for serum theophyline, making the results false positive.
  • Uric acid or Urobilinogen
    Vitamin B1 (thiamin) can cause incorrect blood test results for uric acid or urobilinogen, making the results false positive.

People who know they have to undergo any of the blood tests above need to stop taking vitamin B1 (thiamin) supplements at least 3-4 days prior to taking the blood tests.

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