Can I take Rehmannia glutinosa (Sh熟地黄) after becoming pregnant?
Generally speaking, it is acceptable to consume prepared rehmannia (Shu Di Huang) during pregnancy, but caution should be exercised and medical advice followed. The detailed explanation is as follows:

Prepared rehmannia is a traditional Chinese medicinal herb that has functions of nourishing blood and yin, and enriching essence and marrow. For pregnant women, moderate consumption of prepared rehmannia may help alleviate symptoms such as deficiency of qi and blood, insomnia, and frequent dreaming during pregnancy, and may also promote fetal growth and development. However, it is important to consume it in moderation, as excessive intake may impair digestion and even cause physical discomfort.
Pregnant women have a unique physical condition during pregnancy and should be cautious regarding diet and medication. Although prepared rehmannia offers benefits, it may not be suitable for all pregnant women. Therefore, before consuming prepared rehmannia, pregnant women should consult with a qualified physician or traditional Chinese medicine practitioner to determine whether it is suitable based on their individual constitution and health status.
If a pregnant woman presents with specific conditions such as qi stagnation with excessive phlegm, excessive internal dampness, or poor appetite with loose stools, it is not recommended to consume prepared rehmannia. This is because prepared rehmannia has a sticky and rich nature that may exacerbate these adverse symptoms. During pregnancy, it is important to maintain a balanced diet, avoid excessively cold, spicy, or irritating foods, and maintain healthy lifestyle habits to support the healthy development of the fetus.