Iron, Vitamin D, B12 and Zinc: Which Deficiencies Cause Hair Loss?
Which deficiencies are linked to hair fall, which tests show them, why supplements without a test can backfire, and how long regrowth takes.
LED therapy, also called low-level light therapy, shines light on the scalp to support follicles that are thinning but still present. Trials report a small effect at most, many of them small or short, and only after months of consistent use; some people see no change. At our Rohini clinic in North-West Delhi, the cause of your hair loss is diagnosed before light therapy is even discussed.
Rohini Clinic
North-West Delhi
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Diagnosis first
Months, not weeks
A small effect
Registered doctors

How it works
Light of particular wavelengths is directed at the scalp, under a panel in the clinic or at home through a cap, helmet or comb. You may see it called LED therapy, red light therapy or low-level laser therapy; the aim is to support follicles that are still working.
It does not break the skin and is generally easy to tolerate. Devices differ widely in specification, coverage and price, so a general claim about “LED therapy” says less than it seems to.
The evidence
There is real trial evidence here, which is more than some scalp treatments can say. It is also thinner than device advertising suggests.
Several report a small improvement in thinning hair with regular use over months.
Many of those trials were small or brief, and the devices tested varied widely, so results do not transfer neatly from one device to another.
Some people see no change at all, even with faithful use. Nobody can tell beforehand who will.
The long wait
The schedule depends on the device or the session plan. Using it now and then is, in effect, not using it.
Expected. No hair treatment shows visible change this early.
The mirror looks the same, so sessions get missed. This is where most attempts fail.
Around when any response could first be measured against your baseline photographs.
A question worth answering honestly
Will you keep it up for many months? If the answer is probably not, that is useful to know. It points to a treatment with a lighter routine, and saying so at the assessment is better than buying something that will sit unused. Any benefit also lasts only while you keep going, and generally fades after stopping.
Suitability
Light therapy works only on follicles that are still alive. The examination decides whether yours are.
Checked before starting
Sensitivity to light, any medicine that causes it, and any history of skin cancer on the scalp. Shedding from low iron, thyroid disease or a hormonal problem needs that condition treated; light does not correct it. Our article on telogen effluvium versus pattern hair loss explains why the diagnosis matters, and a hair fall assessment in Rohini is where it is made.
At the Rohini clinic
The diagnosis comes before any talk of sessions or devices, and the review runs over months, not weeks.

Step 01
The cause and stage of your hair loss, reversible causes looked for, and the scalp examined under magnification.

Step 02
Whether light therapy suits your stage of loss, what it can realistically do, clinic or home use, and baseline photographs before starting.

Step 03
Regular use alongside your main treatment, reviewed over months against the baseline, with adherence discussed frankly.
Clinic or home
Both need the same thing from you: regular use over many months. The difference is where it happens, how practical it is to keep up, and what it costs.
Uncommon and usually minor: scalp warmth, mild irritation, and headaches in some users of head-worn devices. Some devices need eye protection, so follow the instructions exactly rather than adapting them. Directions to the Rohini clinic are on the clinic page.
Living in Delhi
Months of regular use decide whether light therapy gets a fair test, and Delhi’s seasons are where routines slip. General points; your own plan comes from the examination.
Sweat and oil build up on the scalp in the hot months and can aggravate dandruff. Follow the session or device instructions on how the scalp should be before use.
Rain, travel and the festival and wedding season are when sessions get missed. Plan around them so the months of regular use hold.
Smog and dust make the scalp dirtier and more irritable, but the evidence linking air pollution to hair loss in people is limited. Real thinning still needs its cause found.
A helmet over a sweaty scalp can aggravate dandruff and folliculitis, so a clean liner and a dry scalp help. Keep a cap or helmet device clean as its instructions say.

When light is not the answer
If the scalp is smooth and the follicles have gone, no light, lotion or injection brings them back. Where the loss is extensive, the useful discussion is a hair transplant in Rohini, if your donor area allows it.
Where follicles remain, other supportive options include PRP and GFC at the Rohini clinic and hair microneedling in Rohini, each with its own limits.
Cost guidance
No price is published. Clinic sessions and a home device are priced quite differently, and the commitment is long-term rather than a fixed course. Your plan, including any treatment alongside light therapy, is quoted in writing after the assessment.
Before paying for months of sessions or a device, make sure the diagnosis is clear, because light works only on follicles that are still present. If PRP or GFC is suggested alongside it or instead, PRP hair treatment cost in Rohini explains how those courses are priced.
Instalment options through third-party lenders may be available; ask at the consultation, and see cost and EMI options.
Clinic or home
How long you keep it up
Treatment alongside
Reviews
Who you will see
Treatment at the Rohini clinic is carried out by registered medical practitioners. Every doctor at DenceSpot is listed below with their qualifications.
Dr. Nyra
MBBS, MD (Dermatology)
Further reading
Plain-language articles on hair loss and its treatment. Each article shows its own author and review details.
Which deficiencies are linked to hair fall, which tests show them, why supplements without a test can backfire, and how long regrowth takes.
How an underactive or overactive thyroid affects hair, the tests that show it, and what to expect once thyroid levels are treated.
Why shedding often starts a few months after childbirth, how long it usually lasts, treatment questions while breastfeeding, and when to get it checked.
Visit the clinic
Hair loss assessments, light therapy sessions and reviews take place at our Rohini clinic in North-West Delhi, near the Outer Ring Road. The clinic card below has the phone number, hours and a map link.
Our clinic
Rohini, Delhi
Every treatment below is carried out at the Rohini clinic, and each starts with an examination and a written plan. See the Rohini clinic page for directions and hours.
Cost guides for the Rohini clinic: Hair transplant cost in Rohini · PRP treatment cost in Rohini · Beard transplant cost in Rohini.
Rohini, Delhi
Book an assessment at the Rohini clinic. You will get a diagnosis, an honest view of what light therapy could and could not do at your stage of hair loss, and a plan that puts your money where it is most likely to count.
