Vitamin A for Reproductive Health
Adequate vitamin A is required for reproduction and fetal development, but excess in pregnancy is teratogenic.
Overview
Verdict
How It Works
Dosing & Protocol
Typical dose
- Recommended dose
- 700-900 mcg RAE/day meets requirements; women who may become pregnant should not exceed the RDA from supplements
- Expected timeframe
- Not established in replete people
Protocol
- form
- Beta-carotene is the safe form in pregnancy since conversion is regulated and it is not teratogenic; preformed retinol must be limited
- duration
- Ongoing dietary adequacy
- co factor
- Take with fat-containing food. Evidence is mixed. Vitamin A is genuinely required for reproduction - retinoic acid signalling governs spermatogenesis, and deficiency causes testicular degeneration in animal models and impairs fertility, while in pregnancy it is essential for embryonic development of the heart, eyes, limbs and nervous system. Correcting deficiency matters, particularly in populations where it is endemic. In replete individuals no fertility or reproductive benefit from supplementation has been shown, and the dose-response curve turns sharply harmful above the upper limit.
- titration
- Never exceed 3,000 mcg RAE/day (10,000 IU) of preformed vitamin A, and stay near the RDA if pregnancy is possible
- starting dose
- Meet the RDA - 900 mcg RAE/day for men, 700 mcg RAE/day for women, rising modestly to 770 mcg RAE/day in pregnancy - preferably from food
Evidence
What the studies say
No studies are yet linked to both Vitamin A and Reproductive Health.
Safety
Caveats
This is the supplement where the pregnancy ceiling matters most. Preformed vitamin A above 3,000 mcg RAE (10,000 IU) per day is teratogenic, causing craniofacial, cardiac and central nervous system birth defects, and the risk window is early pregnancy, often before pregnancy is recognised - so anyone who could become pregnant should stay near the RDA from supplements, avoid liver and liver products entirely, and check that prenatal vitamins use beta-carotene rather than retinol. Isotretinoin and acitretin are absolutely contraindicated in pregnancy, with mandatory pregnancy prevention programmes. Beta-carotene is not teratogenic and is the appropriate supplemental form. Other toxicity: chronic excess causes headache, raised intracranial pressure, hair loss, bone pain, reduced bone density and liver damage. Supplemental beta-carotene increased lung cancer in smokers in ATBC and CARET. For conception, 400 mcg/day of folic acid has strong evidence for preventing neural tube defects. Couples not conceiving after 12 months, or 6 months if the woman is over 35, should be assessed properly.
Less likely to help if
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