The most-studied supplement options for morning sickness

How do the options compare?

Each option is compared on the dose actually studied in pregnancy, how much safety data sits behind it, and where obstetric guidance places it in the sequence.

• Vitamin B6, at 10 to 25 mg every 6 to 8 hours, is the first medication option once diet and lifestyle changes alone aren't enough, with doxylamine plus B6 as the next step. 1
• Ginger, at typical studied doses of about 250 mg three to four times a day, hasn't been linked to a higher birth-defect risk and has research support for easing nausea. 2
• The doxylamine plus B6 combination, at recommended doses, hasn't shown a higher chance of birth defects across hundreds of thousands of pregnancies. 3
• The upper limit for vitamin B6 during pregnancy is 100 mg a day, a ceiling worth watching if you're taking supplement B6 on top of a prenatal vitamin. 4
• Severe or persistent nausea, known as hyperemesis gravidarum, needs a medical evaluation and provider-directed care beyond over-the-counter options. 5

Which option makes sense?

Vitamin B6 at 10 to 25 mg three or four times a day is the usual first step, ginger is the best-studied non-drug option at roughly 1000 mg a day, and adding doxylamine is where guidance goes when B6 alone falls short.

Disclosure: Pregnancy Smart offers a supplement that overlaps with one or more options above. This page describes the pregnancy evidence for each option on its own merits.