Nuan Gong Yun Zi Wan (Warming Palace to Conceive Pill) is a traditional Chinese medicine (TCM) herbal formula designed to "warm the uterus," nourish blood, and improve fertility. It is commonly used to treat cold-type infertility, irregular cycles, and lower back pain. Key ingredients often include Rehmannia, Eucommia bark, and Angelica sinensis. 
Key Details and Usage
Duration: Often recommended to be taken for several months to a year to see effects. 
Amazon.co.uk +5
Purpose: Traditionally used to warm the uterus, promote conception, and address symptoms of coldness in the lower abdomen.
Common Ingredients: Rehmannia (Shu Di Huang), Eucommia (Du Zhong), Cyperus (Xiang Fu), Chuanxiong, Angelica Sinensis (Dang Gui), and Mugwort (Ai Ye).
Recommended Use:
5 Tablets to be taken with water 2-3 times daily.
Keep in cool & dry place, keep out of reach of children