Straight questions, straight answers

Around 50–100 hairs a day is normal, because 10–15% of hairs are always in the resting phase and ready to fall. If shedding is clearly heavier than usual for several weeks, falls in patches, or you can see more scalp, have a specialist look.

Biotin clearly helps only people who are deficient, which is uncommon. Most shedding has other causes — genetics, hormones, thyroid, low iron, stress or scalp conditions. Finding the cause with a doctor matters more than adding biotin.

Hair grows about 1 cm a month and a new hair takes around three months to reach the surface, so any change needs at least 3–6 months. Assess properly at month 6.

When hair falls in patches, sheds suddenly and heavily, the scalp is itchy, red, sore or broken, there are other symptoms like weight loss or fatigue, or 9–12 months of self-care has changed nothing.

A medicated lotion such as minoxidil is a registered drug with medical indications. A scalp serum is a cosmetic that conditions scalp and hair — not a treatment. If a doctor has recommended a medicine, a serum is not a substitute.

Shedding after childbirth is common. It usually starts 2–4 months after the birth and mostly settles by itself within 6–12 months. Eat well, especially protein and iron. If you are breastfeeding, ask your doctor before starting any supplement, and see a doctor if it lasts beyond a year or comes out in patches.

This pattern should be assessed by a hair specialist first — there are evidence-based medical treatments, and earlier is better. Supplements and cosmetics are supportive care, not a substitute for treatment.

Doctors often consider a blood count (CBC), stored iron (ferritin), thyroid (TSH) and vitamin D, depending on your history. The choice is the doctor’s. If you take high-dose biotin, tell them before a blood test, as it can interfere with some results.

U-TURN gives 900 mcg biotin together with zinc, selenium, iron, copper, the full B group, vitamins C, D and E, amino acids and horsetail extract — 18 ingredients in one capsule, so you don’t need several bottles or several reminders.

With breakfast or lunch. Taking it with food lowers the chance of nausea and helps fat-soluble vitamins D and E absorb.

Watch for doubling up, especially selenium and some vitamins. Take both labels to a pharmacist, or ask Hari to compare the numbers as a first step.

Normal — it comes from vitamin B2 (riboflavin), which is water-soluble and excreted. It fades within hours. Dark brown, red or cloudy urine, or pain, should be seen by a doctor.

Yes. Food serial number 74-1-01357-5-0197, verifiable on the Thai FDA system. Made by Cosmed Innovation Co., Ltd. in a GHPs/HACCP-certified facility.

No. We left vitamin A out on purpose: most people already get enough from food or a multivitamin, and taking too much is linked with abnormal shedding.

Yes. U-TURN works from the inside through nutrition; ONE PEN conditions the scalp from the outside.

Once or twice a day, morning and night, on a dry or towel-dried scalp. Part the hair, press once per spot, roll gently. Leave in.

Stop using it, rinse with clean water, and see a doctor if it does not settle. Tell us via "Report a problem" in Hari’s chat or LINE @medology — we log every report.

ONE PEN is a cosmetic that conditions scalp and hair. It is not a medicine and has no medical effect. For hair-loss treatment, see a specialist.

Each ONE PEN holds 15 mL and lasts about 1–2 months used morning and evening as directed. Once opened, use within 3 months · Thai FDA cosmetic notification no. 74-1-6900030861 · first lot ships in early January 2027.

U-TURN: the label says pregnant women should not take it, and if you are breastfeeding, ask your doctor before starting any supplement. ONE PEN: an external-use cosmetic; the label does not restrict it, but during pregnancy and breastfeeding we suggest asking your doctor before starting any new product. Post-partum shedding mostly settles on its own within 6–12 months.

Take the U-TURN label to a pharmacist or your doctor first. Two common points: (1) minerals such as iron and zinc reduce the absorption of some medicines, including thyroid hormone (levothyroxine) and certain antibiotics — leave at least four hours between them; (2) if your doctor already prescribes vitamin D, iron or a multivitamin, tell them so nothing is doubled.

ONE PEN is a cosmetic, not a substitute for medicine. If you use a prescribed lotion, ask your doctor before adding any product, and do not layer the two at the same moment — let the medicine absorb first, as your doctor directs.

U-TURN: children and pregnant women; anyone allergic to an ingredient; anyone with a medical condition or on regular medication should ask a doctor or pharmacist first. ONE PEN: a scalp with open wounds, inflammation or an active rash — wait until it heals; anyone allergic to anything on the INCI list; for children, ask a doctor first. Every ingredient of both is published on the ingredients page.

Yes — one formula, one way of using it. What differs is the cause of hair loss, which a doctor should assess: especially men thinning at the hairline or crown, and women whose post-partum shedding continues beyond a year.

Tell your doctor you take 900 mcg of biotin a day. Biotin can interfere with some tests, including thyroid hormones and cardiac enzymes; the doctor or lab may ask you to stop 2–3 days beforehand — follow that advice.

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Hari is medology’s AI helper. It answers only from a knowledge base curated by our doctors and pharmacists, with sources. It does not diagnose or prescribe, and says plainly when it has no information or when you should see a doctor. Hari is not a doctor and does not replace one.