Choline for fertility

On this page

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

1. What is choline?

Choline is an essential nutrient closely related to the B vitamins. The body produces small amounts of choline, but most must come from diet or supplementation. Choline is critical for cell membrane structure (as phosphatidylcholine), for the production of the neurotransmitter acetylcholine, and as a methyl donor in DNA methylation. During pregnancy, choline plays a particularly important role in foetal brain development and neural tube closure — alongside folic acid.

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

Choline supports fertility through:

1. Methylation. Choline donates methyl groups for DNA, RNA and protein methylation, supporting healthy gene expression.
2. Foetal brain development. Adequate choline supports rapid brain growth in the first trimester and beyond.
3. Neural tube closure. Choline complements folate in reducing the risk of neural tube defects.
4. Liver function. Choline supports the liver in clearing fats and excess hormones.
5. Cell membrane integrity. Phosphatidylcholine forms the phospholipid layer of every cell membrane, including those of eggs and sperm.

3. Fertility benefits

Choline is particularly important for:

1. Women preparing for pregnancy
2. Women with MTHFR polymorphisms (whose folate metabolism may be impaired)
3. Vegans and vegetarians (whose intake is often low)
4. Couples preparing for IVF
5. Anyone with fatty liver, sluggish liver detoxification or oestrogen excess

4. Recommended daily intake

Adequate intake recommendations are around 425 mg per day for women, rising to 450 mg per day in pregnancy and 550 mg per day in lactation. Some experts recommend higher intakes (900–1,000 mg per day) for optimal pregnancy outcomes. Most preconception multivitamins contain little or no choline, so a separate supplement is often required.

5. Food sources

The richest food sources of choline are:

1. Egg yolks (~150 mg per yolk — the single best source)
2. Beef liver and chicken liver
3. Salmon, cod and other oily fish
4. Cruciferous vegetables (broccoli, cauliflower, Brussels sprouts)
5. Soybeans and edamame
6. Whole milk and dairy

Two whole eggs per day provide a substantial portion of preconception requirements.

6. Cautions and contraindications

1. Very high doses (over 3,500 mg per day) can cause a fishy body odour, low blood pressure or sweating.
2. Choline supplementation has been linked to elevated TMAO, a cardiovascular biomarker, at very high intakes — modest doses are safe.
3. Discuss with your doctor if you have liver, kidney or bipolar conditions.
4. 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
• Folic acid
• Vitamin B12
• Vitamin B6
• DHA (omega-3)