A fast growing beard can be caused by a variety of reasons, but is usually not related to kidney deficiency. Growing a beard is a normal physical manifestation of masculinity, some males grow beard fast, some males grow beard slow. The normal male adult, the beard grows fast for two reasons. One reason is the body androgen secretion is too much, beard will be too much androgen stimulation under the rapid growth. The other reason is the intake of too much food containing androgens, resulting in an excess of androgens in the body, causing the beard to grow too fast. The actual fact is that you can find a lot of people who are not able to get a good deal on a lot of things. In daily life, you should ensure a good diet and lifestyle, maintain the stability of the body’s endocrine level, and not abuse drugs and health products.