This herb has been used extensively by Chinese medicine for a long, long time. It is a tonic that aids the blood, heart, liver and spleen and contains large amounts of betacarotene.
It should be noted that when used alone, tang kwei can cause uterine bleeding, so it should be part of a plan, not the whole plan. It also must be avoided by people with hypertension (high blood pressure) or who are pregnant.
Tang kwei appears to stimulate the body to produce estrogen, though it contains none of the hormone's building blocks itself. The effect is so mild, though, that it cannot really be classed as an aphrodisiac.