1. Taboo: People with yin deficiency and excessive fire should not take psoralen; people with heart cell heat during pregnancy should not take psoralen; people with constipation should not take psoralen.

2. Function: Suitable for impotence and spermatorrhea, enuresis and frequent urination, kidney deficiency and asthma, cold pain in waist and knees, late-night diarrhea, psoriasis, vitiligo, and alopecia areata.

3. When using psoralen, you can use psoralen alone or with nutmeg, red dates, ginger, eucommia, dodder, walnut meat, myrrh, frankincense, agarwood, white poria, etc. When using traditional Chinese medicine, psoralen should not be taken by people with yin deficiency and excessive fire; psoralen should not be taken by those with heart cell heat during pregnancy; psoralen should not be taken by people with constipation.