Vitamin B1 (thiamin) for fertility

On this page

1. What is vitamin B1?
2. Function and how it works
3. Fertility benefits
4. Recommended daily dose
5. Food sources
6. Cautions and contraindications
7. My Fertility Guide
8. Related pages

1. What is vitamin B1?

Vitamin B1 (thiamin) is a water-soluble B vitamin that plays a central role in carbohydrate metabolism and energy production. The body can only store thiamin for around one month, so a regular daily intake is necessary. Thiamin is one of eight B vitamins that work together to support energy, the nervous system and red blood cell production.

Reference ranges and recommended intakes vary from country to country — always interpret guidance against the recommendations of your own healthcare authority.

2. Function and how it works

Vitamin B1 is essential for several core metabolic processes:

1. Energy production. Thiamin is a cofactor for enzymes that convert carbohydrates from food into ATP, the body's energy currency.
2. Red blood cell formation. Thiamin contributes to the production of healthy red blood cells, supporting blood building — an important factor for fertility.
3. Nervous system function. Thiamin is needed for the production of neurotransmitters and the maintenance of nerve health.
4. Reproductive cell metabolism. The egg, sperm and developing embryo all have high energy requirements, which depend on thiamin.

3. Fertility benefits

Adequate thiamin levels support the energy production that is essential for follicle maturation, ovulation, sperm production and embryonic development. Many women trying to conceive present with low energy and feelings of exhaustion (in TCM terms, Qi deficiency) — a B-complex supplement that includes thiamin can help support energy levels, particularly when combined with iron and other key nutrients.

4. Recommended daily dose

I recommend a daily dose of 1.5–2 mg of vitamin B1, typically obtained as part of a good-quality prenatal or B-complex supplement. Higher doses are sometimes used short-term but are rarely required for fertility.

5. Food sources

Thiamin is found in a wide range of foods, but levels are dramatically reduced by food processing and preparation. Frozen meat loses around 50% of its thiamin. Tea and coffee can also destroy thiamin in the body. Good food sources include:

1. Whole grains (brown rice, oats, wholemeal bread)
2. Meat, particularly pork
3. Seafood
4. Nuts and seeds
5. Beans and lentils

6. Cautions and contraindications

1. Excessive consumption of black tea, coffee and alcohol depletes thiamin levels — reduce these if you suspect deficiency.
2. Thiamin is generally very safe; toxicity from oral supplementation is extremely rare.
3. Always consult with a fertility specialist or your doctor before starting any new supplement regime.

7. My Fertility Guide

8. Related pages

• Fertility supplements directory
• Vitamin B2 (riboflavin)
• Vitamin B6 (pyridoxine)
• Vitamin B12 (cobalamin)
• Folic acid (vitamin B9)
• Iron