No. According to the inquiry of 39Health.com. If women take deer blood crystals for a long time, it will cause symptoms such as internal heat, spleen and stomach deficiency, liver and kidney yin deficiency, etc. 20 days of taking it is long enough and they should stop taking it. Deer blood crystal is a kind of traditional Chinese medicine, which is derived from the animal sika deer or red deer, and its processed venous blood is used as medicine.