Plan on four to six months. Hair grows about 1 cm (½ inch) a month, so new growth takes around three months to become visible, and randomized trials of red-light devices measured their results at 16 to 26 weeks. A photo comparison at 90 days is a fair first checkpoint, and the full picture comes at four to six months of consistent use.
Below: why hair takes months to respond, a week-by-week timeline for men and women, where the 16–26 week figure comes from, and how to measure your progress properly.
Key takeaways
- Hair grows about 1 cm (½ inch) a month, so any new growth needs two to three months to reach a length you can see.
- Sham-controlled trials of red-light devices measured hair counts and density at 16 to 26 weeks, in men and women with pattern hair loss.
- One 24-week trial already found more hair count, thickness and coverage on the treated side at its 12-week visit.
- Take baseline photos on day one, compare at 90 days, and judge the full result over 4 to 6 months.
- In the largest laser comb trial, the gain in hair density did not depend on age or sex.
Why does hair take months to respond?
Because of the hair growth cycle. About 85–90% of scalp hairs are in anagen, the growth phase, which lasts 2 to 7 years. The rest are resting (telogen) for around three months before the old hair is released and a new one starts.
Red light is thought to help by shifting follicles into anagen and keeping them there longer. Even when that happens early, the new hair starts below the skin and grows about 1 cm a month, so it reaches a visible length weeks later. That is why the trials did not take their measurements until month four or later.
What changes in the first weeks is how the routine feels. A regular six-minute session with massage is relaxing, the scalp feels refreshed, and the habit takes shape, which is what carries you to the months where changes become visible.
What should you expect, week by week?
| Period | What is happening | What you may notice |
|---|---|---|
| Weeks 1–4 | The routine becomes a habit. Follicles entering anagen now are still weeks from producing visible hair. | A relaxed, refreshed scalp after sessions. Take your baseline photos now. |
| Weeks 5–12 | New hairs that started in month one reach 1–2 cm by week 12. | Possibly short new hairs along the part, hairline or crown, and less hair in the brush. Photos confirm these early signs better than memory. |
| Around day 90 | First checkpoint. One trial found measurable differences at 12 weeks. | Compare photos side by side with day one. |
| Weeks 13–26 | The window in which the trials measured hair counts and density. | Changes in density and coverage become clear in photos. Keep going if you see a change. |
| Beyond 26 weeks | Maintenance. Pattern hair loss is ongoing, so the routine continues. | Keep the routine and compare photos every few months. |
Where does the 16- to 26-week figure come from?
From the randomized, sham-controlled trials of red-light devices in pattern hair loss. Each compared a working device with an identical-looking sham and measured at a fixed point.
- Lanzafame 2014 randomized 47 women aged 18 to 60 to a 655 nm helmet or sham, used every other day for 16 weeks; 42 completed. Hair counts in a 2.85 cm² test area rose by about 100 in the active group versus about 24 with sham.
- Lanzafame 2013 used the same helmet in 44 men with Norwood IIa–V loss for 16 weeks and found significantly higher hair counts than sham.
- Jimenez 2014 randomized 128 men and 141 women to one of three laser combs or sham, three times a week for 26 weeks, with checks at 16 and 26 weeks. At 26 weeks, terminal hair density had risen by 18.4 to 25.7 hairs per cm² in the laser groups, compared with 1.6 to 9.4 in the sham groups. Of those randomized, 44 were lost to follow-up, and the increase did not depend on age, sex or comb model.
- Fan 2018 treated one side of the scalp and used sham on the other in 100 people, three times a week for 24 weeks. The treated side showed greater improvement in hair count, thickness and coverage at both the 12- and 24-week visits.
So the 90-day point is grounded in the data: it is when the earliest trial checkpoints began to show differences, and the main measurements followed at 16 to 26 weeks. Most trials followed participants for up to 26 weeks. For the full set of trials, see does red light therapy work for hair loss?
How long does scalp massage take to show results?
The main massage study ran for 24 weeks. Koyama and colleagues (2016) gave nine healthy Japanese men 4 minutes of standardized scalp massage a day and measured hair thickness, which rose from 0.085 mm to 0.092 mm at 24 weeks, an increase of about 0.007 mm per hair. The study enrolled men without hair loss, so results in women and in people with thinning haven't been measured yet.
Massage also helps spread a topical evenly over the scalp, which makes it a natural partner for a serum or oil. Our guide to scalp massage for hair growth covers technique and frequency.
What affects how fast you see results?
- The cause of your thinning. The trials studied androgenetic alopecia. Shedding after illness, stress, childbirth or a crash diet (telogen effluvium) follows its own timeline: it starts about 2–3 months after the trigger, acute shedding usually settles within about six months, and most people see normal fullness return within 6–9 months after shedding stops. Our guide to telogen effluvium explains how to tell the two apart.
- Consistency. The trials used their devices three times a week, every other day or daily for the whole period. A steady schedule matters more than long sessions.
- Your starting point. The trials enrolled early to moderate loss: roughly Norwood II–V in men and Ludwig I–II in women. Follicles that are thinning but still producing hair have the most room to respond.
- Other changes. If you start minoxidil, a new supplement or a new medication at the same time, it becomes harder to tell which change is responsible. That is fine if you are happy with the combination; just note the start dates.
How do you measure progress?
Use photos, not memory. Day-to-day changes are too small to notice in the mirror, and a consistent photo routine makes a real difference visible.
- Set up your photos on day one. Same room, same light (daylight from a window is the most consistent), same time of day, dry hair, camera at the same distance.
- For men: photograph the hairline from the front with hair pushed back, each temple from the side, and the crown from above. These match the Norwood pattern.
- For women: photograph your part from above in the same place each time, plus the crown. A widening part is the main Ludwig sign. If your hair is long enough, measure ponytail circumference with a piece of string.
- Compare at 90 days. Put the photos side by side rather than relying on memory.
- Compare again at 4–6 months. This matches the window the trials measured.
Counting hairs in the drain is a poor guide, because daily shedding varies. Our guide to how much hair loss is normal explains why, and what to track instead.
How do you get the most from each session?
Keep the schedule steady, get the light to the scalp and pair it with a routine you enjoy. Our step-by-step guide to using a scalp massager covers technique, and our explainer on red light wavelength and dose shows how session time and irradiance add up to a dose.
The Folliq Red Light Scalp Massager is built for that kind of routine: a 6-minute session with automatic shut-off, 24 red LEDs at 660 nm, 56 light-guide silicone bristles and three levels of sonic vibration, used 3–5 times a week. Its refillable 12 ml cartridge holds your own scalp serum or oil, so massage spreads it evenly as you go. Ninety days gives you a first, fair photo comparison, which is why every Folliq product comes with 90 days to try it. The trials measured at 16–26 weeks, so if you see a change at 90 days, keep going.
If you would rather go hands-free, a cordless LED cap follows the same clock. With the Folliq Red Light Cap, wear it for 10 or 20 minutes, 3 to 4 times a week, take your baseline photos on day one, and give it at least four months before you judge it, in line with the 16- to 26-week window the trials measured.
When should you reassess your routine?
Review your photos at six months of consistent use. If you see progress, keep the routine going, since pattern hair loss is ongoing. If you see no change, book a dermatologist appointment to confirm the diagnosis and discuss the full range of options, including combining approaches.
When to see a doctor
A scalp routine should never delay a diagnosis. See a doctor or dermatologist if:
- Hair is coming out in clumps or patches
- Shedding is sudden or heavy, or has lasted more than six months
- Your part has widened or your hairline has receded noticeably within a year
- You have scalp pain, burning, scaling or redness
- You have never had ferritin, thyroid or vitamin D tested
FAQ
Can you see results from red light therapy in a month?
Visible new growth in the first month is unlikely, because new hair grows about 1 cm a month and starts below the skin. Changes you notice early are more likely to be how the scalp feels or how your hair is styled. The first fair comparison point is around 90 days.
Does hair shed more when starting red light therapy?
Some people notice temporary shedding: Suchonwanit's 2019 helmet trial listed temporary hair shedding among its side effects. If shedding is heavy or lasts more than a few weeks, check with a doctor.
How many times a week should you use a red light scalp massager?
Follow the device's instructions. The Folliq massager is designed for 3–5 sessions a week, and the trials used schedules from three times a week to daily. Consistency over months matters more than extra sessions.
Do men and women see results on the same timeline?
In the trials, yes. Jimenez 2014 found the gain in hair density did not depend on sex or age, and the Lanzafame trials in men and in women both measured at 16 weeks. Men tend to track the hairline and crown; women usually track the part.
What happens if you stop using red light therapy?
Pattern hair loss continues over time, so any routine works best as an ongoing habit. Most trials followed participants for up to 26 weeks, so long-term results after stopping haven't been measured yet.
Folliq products are cosmetic scalp-care products, not medical devices or medicines, and are not intended to diagnose, treat, cure or prevent any disease. The studies discussed here used clinical devices and preparations, which is why every Folliq product comes with 90 days to try it for yourself. If your hair loss is sudden, patchy or painful, see a dermatologist.
References
- Lanzafame RJ, Blanche RR, Chiacchierini RP, Kazmirek ER, Sklar JA. The growth of human scalp hair in females using visible red light laser and LED sources. Lasers Surg Med. 2014. PubMed 25124964
- Lanzafame RJ, Blanche RR, Bodian AB, et al. The growth of human scalp hair mediated by visible red light laser and LED sources in males. Lasers Surg Med. 2013. PubMed 24078483
- Jimenez JJ, Wikramanayake TC, Bergfeld W, et al. Efficacy and safety of a low-level laser device in the treatment of male and female pattern hair loss: a multicenter, randomized, sham device-controlled, double-blind study. Am J Clin Dermatol. 2014. PubMed 24474647
- Fan SM, Cheng YP, Lee MY, Lin SJ, Chiu HY. Efficacy and safety of a low-level light therapy for androgenetic alopecia: a 24-week, randomized, double-blind, self-comparison, sham device-controlled trial. Dermatol Surg. 2018. PubMed 29957664
- Suchonwanit P, Chalermroj N, Khunkhet S. Low-level laser therapy for the treatment of androgenetic alopecia in Thai men and women: a 24-week, randomized, double-blind, sham device-controlled trial. Lasers Med Sci. 2019. PubMed 30569416
- Koyama T, Kobayashi K, Hama T, Murakami K, Ogawa R. Standardized scalp massage results in increased hair thickness by inducing stretching forces to dermal papilla cells in the subcutaneous tissue. Eplasty. 2016. PubMed 26904154