In time, everyone's hair turns gray. Your chance of going gray increases 10-20% every decade after 30 years. Initially, hair is white. It gets its natural color from a type of pigment called melanin.
As we age, melanocytes decrease in number and less melanin is produced. Fewer melanocytes mean a lack of pigment in the hair, resulting in a silvery-gray color. Now the hair itself is not actually white; it is an optical illusion that results when light is refracted off the hair, creating a silver-like look.
Genetic factors, stress, hair dyes, and other factors may contribute. The human body has millions of hair follicles or small sacs lining the skin. The follicles generate hair and color or pigment cells that contain melanin. Over time, hair follicles lose pigment cells, resulting in white hair color.
This buildup can damage the pigment-producing cells, leading to gray or white hairs. In women, graying usually begins right around the temples and then moves toward the top of the scalp. As it gets lighter, it may eventually turn white.
Typically, white people start going gray in their mid-30s, Asians in their late 30s, and Blacks in their mid-40s. Half of all people have a significant amount of gray hair by the time they turn 50.
Most people start noticing their first gray hairs in their 30s—although some may find them in their late 20s.This period, when graying has just begun, is probably when the process is most reversible, according to Paus.
Gray hair comes down to melanin, or rather the lack of melanin. Melanin is the pigment that gives hair its color. Gray hair has reduced melanin, while white hair completely lacks it.
From the time a person notices a few gray hairs, it may take more than 10 years for all of that person's hair to turn gray. Some people think that a big shock or trauma can turn a person's hair white or gray overnight, but scientists don't really believe that this happens.
A new study shows that stress really can give you gray hair. Researchers found that the body's fight-or-flight response plays a key role in turning hair gray. Your hair color is determined by pigment-producing cells called melanocytes.
However, the rate of hair colour loss is largely determined by your genes. The chances are that you will experience premature greying if your parents do. However, certain nutritional deficiencies and underlying medical conditions may play a role. In these cases, yes, white hair can turn black again.
In time, everyone's hair turns gray. Your chance of going gray increases 10-20% every decade after 30 years. Initially, hair is white. It gets its natural color from a type of pigment called melanin.
The hair can't actually turn white overnight, because all the hair is "dead", and the only way you can make its colour change is with dyes. Hair gets its colour from a chemical called melanin, which is pumped in by cells at the base of the hair follicle.
Science of Grays
As you age, these cells start to die. Without pigment, new hair strands grow in lighter and take on various shades of gray, silver, and eventually white. Once a follicle stops making melanin, it won't make colored strands again.
Blonds get white hair just like brunets, but some blondes only appear to get a lighter blond while others experience their blonde hairs getting darker and duller as the white hairs begin to appear. Still, blondes can, over time, have a full head of white hair.
Although the primary cause of premature hair graying (PHG) is considered to be genetic, certain environmental factors also play a role. Trace element deficiencies such as Vitamin B12, Vitamin D3, and calcium may also be associated with PHG.
Genetics is usually the biggest indicator that you're likely to get white hair at a young age but other factors can speed up the process, too. As mentioned, you may have inherited your parents' predisposition of gray early. "Your predilection for graying is inherited as an autosomal dominant gene," says Dr. Ciraldo.
Red hair is the rarest hair color, with only 1% of the world's population having this hair shade. 8. 1% of the world's population has gray or white hair worldwide.
Your scalp health will improve.
"Letting your hair go gray is an effective way to avoid exposing your scalp to toxic ingredients of hair dyes," says Monica Davis, a professional hairstylist and founder of Hair Scream. Instead, your scalp will be calm and free of any rouge dye stains.
And while it may seem intuitive that stress can accelerate graying, the researchers were surprised to discover that hair color can be restored when stress is eliminated, a finding that contrasts with a recent study in mice that suggested that stressed-induced gray hairs are permanent.
Vitamins and minerals deficiency
Follicle whitening can also be caused by iron deficiency, folate deficiency, vitamin D deficiency, and vitamin B12 deficiency. Premature graying of hair is associated with folic acid deficiency and low levels of biotin.
Premature graying may be reversed with vitamin B12 supplementation only if vitamin B12 deficiency is the cause. If you are graying due to other factors, such as genetics, zinc deficiency, and medications, your gray hair cannot be reversed.
Scientists still don't know why some people turn gray early, late, or not at all, although they suspect genes, nutrients and possibly the immune system play a role in depleting melanocyte stem cells.