7 comments on âOcean Sunfish are the most useless animal (an epic rant)â. 1  Man alive, when are humans going to realize the world wasnât made for them? 2  So what if this animal grows as nothing more than a source of food for others.
The most important hormones affecting the health of skin, hair and nails are estrogen (especially in proportion to testosterone), thyroid hormones and cortisol. Estrogen: Not surprisingly, estrogen levels affect every part of the body, including hair, skin and nails.
Dr. Richard Scher, a dermatologist who is widely known for his expertise on nail care and disorders, argues that it isn't totally clear what role biotin plays. However, he believes taking the vitamin does improve the keratin infrastructure (a basic protein that makes up hair, skin and nails). Biotin deficiency is rare and low levels may result in brittle nails and hair loss, explains Dr. Stuart.