Yes, a Vitamin D Deficiency can cause hair loss. When it is corrected, you may not see a reversal of the hair loss if there is a genetic component to it.  Women often have complex hair loss problems so careful evaluation is critical before drawing conclusions to the cause of hair loss which is often not so simple as taking Vitamin D

http://articles.latimes.com/2009/mar/11/business/fi-lazarus11

“Society discriminates against bald people,” said Dr. William Rassman, who runs the New Hair Institute. “If you have two people coming in for a job, and one of them is partly bald, you’ll think that the one with hair has more youth and vitality.”  Read the rest of the article as it gives good insights into the balding problem directly from the folks that know

We have been using SMP (with our classic stippled pattern) and microblading, resulting in a nice effect as shown in this photo (before on tap, after on bottom). This patient still has a very thin look, so to obtain a fuller look, he should get a hair transplant.

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3944668/#!po=14.7887

I have read the article. There is a great deal of speculation about the use of light therapy in certain areas, like graft growth after hair transplants. I know that grafts grow after a hair transplant when the surgery is done correctly and can’t be accelerated using such a modality. The author speculated on the use of infra-red light, but there is no evidence available for this use either. Most of the studies on LLLT therapy are written by people who have something to profit from by pushing this technology. Laser hats and other devices cost up to $3000 retail. Almost half of the money goes to the doctor selling it, so do you think that a doctor can be impartial when bringing you this technology?  I don’t sell them because I refuse to make money from my patients without giving them value.

What can I do about this?  I am 21 and thought that the hair transplant would solve my problem.

Your doctor should never have done a hair transplant on you, a 21-year-old male. Your balding is progressive, and as you get older, it will get worse.  You developed shock loss over the past year, accelerating the hair loss that was going on at the time of the hair transplants.  I will not do a hair transplant on a patient under 25 unless circumstances are highly unusual. Your doctor is guilty of malpractice and greed because he put your money in front of your welfare.

An FUE surgery of 5,000 grafts is most likely too many grafts for the donor area in 98% of the population. As a result, you have a problem with over-harvesting which produces a see-through donor area. The original density may have been too low to support that number of FUE grafts you had done.  You now have a depleted donor area, and since your hair appears short in the photo, this problem is made worse. If you let your hair grow out more, maybe it will cover this overharvested donor area. One reasonably good solution is Scalp Micropigmentation (see here: https://scalpmicropigmentation.com/scar-covering/).

Whatever you do, do not do another FUE as your situation will become worse. FUE is often promoted as a scar-less surgery, but clearly it is misleading as in your situation. You can either let your hair grow longer to cover it or get Scalp MicroPigmentation which will camouflage these bald areas exceptionally well.

See here: https://scalpmicropigmentation.com/scar-covering/

If I start fin again what are the chances they will become weaker again? And is there any way I can avoid that?

This is what I recommend to my patients. One pill every fourth day for two weeks, and if that works, go up to one pill every three days for two weeks. Then, one pill every two days and stop there.

The appearance of thinning in the corners of a female hairline is common as age sets in. A hair transplant can easily address this as well as the high hairline and the ledge that you show on the upper front of the forehead, which suggests a hairline that is higher than your normal female hairline position.

At one month, many people will see that the hair loss has stopped, and that alone may show improvement. Most people (about 95%+) will see no side effect, so that is not unusual.

A 2017 gene study of 52,000 40-69 year old males tried to identify genes associated with balding, and they identified over 250 genetic markers common in bald men. They then tried to use it to predict MPB with some success. Total of 61% in the lowest risk group had hair loss, with 14% of it being severe. The highest risk had 58% with moderate to severe loss. http://journals.plos.org/plosgenetics/article?id=10.1371/journal.pgen.1006594

Even after identifying this many genes its far from perfect. We can logically deduce it’s more likely that there is no MPB gene. Genetics increase susceptibility, but that applies to everything else. This also explains why most old men will exhibit recession, and why everyone recedes to different extents.

Interesting.  Thanks for the information.