Nails and hair are both made from keratin, and any changes in your body’s keratin production will impact their health. For example, healthy hair and nails should have a certain amount of flexibility. Dehydration or any form of malnutrition can cause your nails and hair to become brittle and easily broken.

Many factors, such as stress, aging and genetics can cause your hair to lose its color and turn gray or white. Low levels of certain vitamins and minerals can also have a role in hair color loss.

Melanocytes are cells naturally produced by your body. These cells emit melanin to provide your hair with its natural color. As you age, melanin production slows, and you may suffer from gray hair.

Human hair grows at an average speed of 6 inches per year. This is fairly slow, especially if you are waiting for your hair to grow out for a special occasion, or if you have experienced a mishap at the hairdresser. Unfortunately there isn't a way to make hair grow much faster, either naturally or chemically.

Finasteride, brand name Propecia, is a medication which is often used to prevent balding, particularly the variety known as male-pattern baldness. This loss of hair is linked with the conversion of testosterone to another chemical, known as DHT.

Low iron, also known as iron deficiency anemia, is common, according to the MayoClinic.com. The most common symptoms are fatigue, weakness and pale skin. However, the MayoClinic.com notes that the condition can also cause hair loss.

According to the University of Maryland Medical Center, the average person has 100,000 hairs on their head and loses about 100 hairs daily. Hair loss can quickly become a concern, however, when that rate of loss increases and bald spots begin to appear.

When you're trying to grow out a short cut, hair growth seems to take forever. Your hair doesn't grow continuously as your fingernails do. The hair on the scalp goes through three phases of growth. The vast majority of hair on your head is in the anagen, or growing, phase.

Although infants grow at different rates, there are some standards for measurement, including length, weight and developmental skills that can be used to gauge the health of an 11-month-old. On average, babies grow from about 7 lbs. at birth to about 21 lbs. by 11 months.

If you’re a woman, watching your lip hair change from light, downy fuzz to coarse, dark hair that rivals a man’s mustache can be very unsettling. Generally speaking, heredity and hormonal factors play a large role in this development, and there is usually no need for alarm.

Rose oil has long been used to promote a, well, rosy complexion. Rose oil has an intricate chemical composition that consists of some 300 different compounds. The same properties that nourish a person’s skin also nourish a person’s hair. While beneficial, rose oil is expensive to produce.

The ribs are a series of bones that protect the vital organs in the thorax such as the heart and lungs. Like all bones, the ribs begin to form in the developing embryo, but they continue to grow and develop throughout childhood. Some genetic and metabolic problems can lead to abnormal rib growth in children.