Potentially your hair should grow back within 6-8 months, all other factors being normal. Also you could try minoxidil with could be helpful as well.
Fortunately, the effects of malnutrition on your hair are reversible as long as you regain nutritional stability for 6 months or more. Once the deficiencies are corrected, your hair will grow back — although it may take some time. High dose vitamins, supplements, and dietary modifications can balance nutrient levels.
After about a month, hair may begin to grow back at its typical rate of 4 to 6 in. per year.
“Supplementing vitamin D can often be helpful since most people are deficient—along with other key nutrients, typically iron, vitamin C, and biotin—in restoring hair loss. It certainly helps thicken existing hair,” Levitan says.
The good news is that hair loss due to vitamin D deficiency is usually reversible. Once levels of vitamin D are increased, hair follicles will typically begin to function properly again and hair will start to regrow.
Vitamin D3 supplements are thought to raise vitamin D levels in the bloodstream in around 24 hours. However, it takes up to 7 days for this to be converted into the active form of vitamin D – which is what a blood test will pick up.
Lifestyle factors could include using certain hair products, wearing your hair up too tightly, experiencing high stress levels, or not getting enough of certain vitamins and minerals in your diet. People who have immune system deficiencies could also have thinning hair.
Too Much Vitamin A
Supplements can contain 2,500 to 10,000 IU. So, any more than that, you could risk some strands falling out. The good news is too much vitamin A is also a reversible cause of hair loss. Once the excess vitamin A is halted, hair should start growing normally again.
Iron deficiency hair loss can look like traditional male- and female-pattern hair loss. A study published in the Journal of Korean Medical Science found that iron may not only play a role in hair loss, but it may cause hair to fall out in a fashion similar to that of genetic male- and female-pattern baldness.
Because hair thinning and poor hair growth are sometimes associated with a biotin deficiency, correcting a deficiency can help restore hair growth in some people. Several other factors can also cause hair loss and thinning, including a deficiency in other nutrients like iron and zinc.
Vitamin D supplements are an excellent way to improve your Vitamin D blood levels. Unfortunately, not many foods naturally contain an adequate amount of Vitamin D. If you are consistent with taking your Vitamin D supplements, there is a likelihood that you will see hair regrowth results within six to eight weeks.
The B vitamins that affect hair growth are Vitamin B6, folic acid, and Vitamin B12. These vitamins are important for proper formation of red blood cells, which carry oxygen to the tissues, including the hair.
The type of hair loss caused by poor diet is temporary, and it's called telogen effluvium. It means the growth cycle has halted during the telogen phase, so the follicle is resting and a new strand of hair isn't growing. The hair becomes thinner, and you may notice an increase in hair shedding from the scalp.
Here's the hard truth: Little can be done to permanently change the diameter of individual hair strands. Thickening products can do wonders to temporarily plump hair strands, but when it comes down to it, fine hair is genetic and can't be changed.
Wearing your hair too long will make it look thinner
"Ironically, with thinning hair it's important to make sure you get your hair cut regularly," says Julie Hensman, from Hensmans in Northampton. "Thinning hair can get out of shape more quickly, making it look more obvious".
How much B12 should I take daily for hair growth? The lowest amount recommended that should be traceable in your body is 2.4 mcg. While you are looking for a difference in your hair growth you can increase this dosage to 3 mcg and beyond.
Sources of Biotin
Foods that contain the most biotin include organ meats, eggs, fish, meat, seeds, nuts, and certain vegetables (such as sweet potatoes) [2,12].
It may take a few weeks before your vitamin B12 levels and symptoms (such as extreme tiredness or lack of energy) start to improve. If you have hydroxocobalamin injections to boost your vitamin B12 levels at the start of treatment, the cyanocobalamin tablets may start to work within a few days.
Taking hair growth supplements does not produce results overnight; it usually takes a long time (one to five years) to see results. Normally, hair grows only half an inch a month, so even after taking supplements, it would take five to six years for a new strand of hair to reach shoulder length.
1. Biotin. Biotin (vitamin B7) is important for cells inside your body. Low levels of it can cause hair loss, skin rashes, and brittle nails.