This article is for information only. It isn’t medical advice, and it isn’t a diagnosis. Hair loss has many causes and some of them are serious — please see a doctor or dermatologist rather than treating yourself from a blog post, including this one.
Here’s something I noticed while researching this piece.
Almost every hair loss article online jumps straight to products. Try this oil. Use this serum. Buy this supplement. Take minoxidil. Nobody stops to ask the obvious question first: why is your hair falling out?
And that’s a strange way to approach it, because hair loss isn’t one condition. It’s a symptom. Iron deficiency, thyroid problems, PCOS, a fever you had three months ago, a crash diet, a pregnancy, genuine genetic pattern loss — these all show up as hair in the drain, and they need completely different treatments. Treating all of them with the same bottle of serum makes about as much sense as taking the same medicine for every kind of headache.
So before you spend a single rupee on anything, I want to talk about the step almost everyone skips.
Why this matters more for us
Most of the big hair loss articles you’ll find are written for an American or European reader. That’s fine as far as it goes, but a few things are genuinely different for South Asian women, and they change what you should be checking first.
Anemia and iron deficiency are widespread among women in South Asia. One review of Pakistani data found anemia prevalence around 56.9% among adult non-pregnant women of mixed socioeconomic status, and a national survey of nearly 7,500 non-pregnant women aged 15–49 put iron deficiency anemia specifically at 18.1%.
Vitamin D is worse, and it surprises people because we have so much sun. A community study of premenopausal women in Karachi found 90.1% were vitamin D deficient. Another, found 73% of women of child-bearing age were deficient, with risk linked to lack of sun exposure. Between indoor work, covered clothing and staying out of the heat, most of us are simply not making it.
None of this means your hair loss is definitely nutritional. But it does mean that if you live in South Asia and haven’t been tested, you’re guessing — and the odds aren’t in your favour.
The five tests to ask for
Take this list to your doctor. You don’t need to argue for all five; just show it and ask which apply to you.
1. Serum ferritin
This is your stored iron, and it’s the one most people miss. It’s not the same as hemoglobin — you can have completely normal hemoglobin, no anemia at all, and still have empty iron stores. Hair follicles are among the fastest-dividing tissue in your body, so they feel a shortage early.
2. Complete blood count (CBC)
Checks for actual anemia and gives your doctor a fuller picture alongside ferritin.
3. Thyroid panel (TSH, and free T4 if your doctor wants it)
Both underactive and overactive thyroid cause diffuse hair thinning, and thyroid problems are frequently missed in women for years.
4. Vitamin D (25-hydroxy vitamin D) Given the numbers above, this is worth knowing regardless of your hair.
5. Hormonal panel — testosterone, DHEA-S, and others your doctor may add. Especially relevant if you also have irregular periods, acne along the jaw, or unwanted facial hair, since PCOS is a common and treatable driver of hair thinning.
I’d suggest asking about all five together rather than one at a time. Doing them in one sitting costs less overall and saves you weeks of going back and forth.
(Prices vary a lot between labs — I’d recommend calling your nearest collection centre for current rates before you go, and asking whether they do a package rate for a panel rather than individual tests.)
The supplement mistake that ruins your results
This is the part I really want you to read, because almost nobody mentions it and it can send you down completely the wrong path.
If you’re taking a biotin supplement — a hair, skin and nails vitamin — it can make your blood test results wrong.
Not “slightly off.” Wrong in ways that can look like a real diagnosis. The FDA issued a formal safety communication about this, warning that biotin, commonly found in dietary supplements, can significantly interfere with certain lab tests and produce incorrect results that go undetected.
Here’s why it matters for exactly the tests we’re discussing. Many labs use a biotin-based method to run these assays, so extra biotin in your blood jams the mechanism. Hospital lab guidance lists thyroid hormones T4 and T3 as being falsely increased, while TSH and ferritin come back falsely decreased — with the effect appearing at supplement doses above roughly 5 mg per day, well above nutritional needs and common in over-the-counter cosmetic products.
Read that again: falsely low ferritin, falsely low TSH.
So picture what happens. You’ve been taking a hair supplement for three months. You get tested. Your ferritin comes back low — but it isn’t really low, it’s the biotin. You start iron supplements you don’t need. Meanwhile your TSH looks low too, which can suggest an overactive thyroid you don’t have. One case report describes a patient whose thyroid, parathyroid and calcium results all looked alarming, and once the biotin was stopped and the tests repeated a month later, everything came back normal.
The fix is simple. Stop biotin before testing and tell the lab you were taking it. How long depends on your dose and the machine the lab uses — one study found that interference from 5 mg/day cleared in about 8 hours on the platforms tested, while 10 mg/day took one to two days. Ask your lab, and when in doubt leave more time rather than less.
Ordinary multivitamins are generally not the problem — doses up to 1,000 mcg haven’t been reported to cause interference, and dietary biotin from food is far too low to matter. It’s the high-dose hair supplements that cause this.
So where does minoxidil actually fit?
Once you know your numbers, minoxidil becomes a real option rather than a guess. Let me be straight about what it does and doesn’t do.
It works, and it’s the best-evidenced option there is. Topical minoxidil is the only FDA-approved treatment for pattern hair loss in both men and women. In a 48-week trial of 381 women, 5% topical minoxidil beat placebo on all three main measures — hair count, and both patient and investigator assessment of growth and scalp coverage — and outperformed the 2% version on patients’ own assessment of benefit. A Cochrane review of the wider evidence supported both the effectiveness and safety of topical minoxidil for female pattern hair loss.
Your hair will probably fall out more at first. This is the thing nobody warns people about, and it makes women quit in week three thinking they’ve made it worse. Minoxidil works by pushing resting follicles into the growth phase, so a temporary increase in shedding when you start is expected. It’s a sign it’s working, not failing. Give it six months before you judge.
The common side effects are local. Mostly contact dermatitis and unwanted hair growth, with the 5% version more likely to cause itching and irritation than the 2%.
The oral version is a real thing, and it’s not a small decision. Low-dose oral minoxidil is used off-label and some dermatologists prefer it. But in a survey of 102 women taking it, unwanted hair growth occurred in 71.6% of patients, most often on the face, arms and legs. Notably, 93.2% didn’t consider it a reason to stop, and hair loss severity improved from a median of 7 to 4 on a 10-point scale. That’s a genuine trade-off, and it’s a conversation for a dermatologist — not something to order online.
And here’s the honest limitation: minoxidil treats pattern hair loss. If your hair is falling because your ferritin is at 8 or your thyroid is off, minoxidil doesn’t fix the cause. You’d be spending money every month to fight a problem while it continues.
What about rosemary oil and the natural alternatives?
You’ve seen the posts. “Rosemary oil beats minoxidil.” Let me tell you what that study actually says, because the truth is more interesting than the headline.
It’s real research. Panahi and colleagues, published in 2015, randomly assigned 100 people with pattern hair loss to either rosemary oil or 2% minoxidil for six months. Neither group changed at three months, but both showed a significant increase in hair count at six months compared to baseline, with no significant difference between them — and scalp itching was notably more common in the minoxidil group.
So rosemary isn’t nonsense. But look at what the comparison actually was:
- It was tested against 2% minoxidil, the weaker over-the-counter strength — no study has compared rosemary oil to 5% minoxidil or to finasteride
- It’s one trial with 100 participants, and it ran without a placebo arm and has not been independently repeated
- Minoxidil has decades of trials behind it
The reasonable conclusion, which is what most dermatology sources land on: rosemary oil may be a useful addition, but it isn’t a validated substitute for minoxidil in pattern hair loss. If you can’t tolerate minoxidil, or you want something alongside it, it’s cheap and low-risk. Just don’t expect it to do a job it hasn’t been shown to do.
And that’s the honest answer for most “natural alternatives” — the enthusiasm online runs well ahead of the evidence.
What I’d actually do for Hair Fall
If I were starting from scratch:
- Get tested first. All five, in one go, before buying anything.
- Stop biotin supplements before the test. Tell the lab. Don’t skip this.
- Take the results to a doctor rather than interpreting them yourself — especially the thyroid and hormonal ones.
- Fix what the tests find. If it’s iron, that takes months to correct and your hair follows well behind your bloodwork. Be patient.
- Then consider minoxidil, if pattern hair loss is genuinely what you have, and expect early shedding.
- Add rosemary oil if you want to — as a supporting act, not the main treatment.
One more thing worth saying. There’s a real gap between “normal” on a lab report and “enough for your hair,” and the research on where exactly that line sits for ferritin is genuinely unsettled — some studies find a strong association with shedding, others find none. So don’t panic if a number sits just inside or just outside the reference range, and don’t let anyone sell you a supplement on the strength of a borderline result. That’s a conversation for your doctor with your full picture in front of them.
Hair loss is frightening, and the industry knows it. That fear is why there’s a product for every worry and very little advice telling you to slow down and find out what’s actually happening first.
Find out first. It’s cheaper, and it works better.