Green Tea / Matcha

Safety Status: Moderate (Limit Consumption)

Green tea and matcha are safe to consume during pregnancy, but only in moderation.

A standard 8-ounce cup of green tea contains 30 to 50 mg of caffeine, while a serving of matcha (made from stone-ground green tea leaves) contains about 70 mg of caffeine. The American College of Obstetricians and Gynecologists (ACOG) recommends keeping total daily caffeine below 200 mg to prevent risks of low birth weight.

However, green tea has a second, pregnancy-specific caution: it contains epigallocatechin gallate (EGCG), a powerful antioxidant.

In clinical studies, EGCG has been shown to temporarily block the action of dihydrofolate reductase (DHFR), an enzyme essential for cellular absorption of folate (folic acid).

Because folate is critical—especially in the first trimester—to prevent neural tube defects such as spina bifida, consuming large quantities of green tea can reduce folate bio-availability.

Tannins and Iron Absorption

Like black tea, green tea contains tannins, which are astringent polyphenols:

• Tannins bind to non-heme iron (plant-based iron) in your digestive tract, preventing your body from absorbing it.
• To avoid worsening pregnancy-related anemia, do not drink green tea at the same time you take your prenatal vitamins or eat iron-rich meals. Allow at least 1 to 2 hours between green tea consumption and iron intake.

Safe Intake Recommendations

To enjoy green tea and matcha safely during your pregnancy:

• Limit to 1-2 Cups Daily: This keeps your caffeine intake low and minimizes the inhibitory effect of EGCG on folate absorption.
• Decaf Options: Choose decaffeinated green tea, preferably processed using the non-chemical carbon dioxide or water methods.
• Avoid Concentrated Extracts: Do not consume green tea dietary supplements, pills, or weight-loss extracts, as these contain extremely high, unregulated concentrations of EGCG and caffeine that are dangerous for fetal development.