Our Proprietary Hair Growth Technology Is Backed By Real Science.
Two rigorous studies have proven the GroWell red light therapy cap, from Apira Science, is one of most effective hair loss solutions for women and men. 100% of treated participants regrew hair.
- Published in a respected medical journal
- Peer reviewed
- Double-blind and placebo-controlled
- Presented at prestigious medical conferences
Makers of the GroWell Red Light Therapy Cap
Hair Regrowth Results for Women
In a randomized, double-blind, placebo-controlled study published in Lasers in Surgery and Medicine (2014), the official journal of the American Society for Laser Medicine & Surgery, 42 women aged 18–60 with androgenetic alopecia used a 655nm red light device for 25 minutes every other day for 16 weeks. Hair counts rose an average of 48% with the active device, compared with 11% with placebo, a 37-point difference (P < 0.001). No side effects were reported. The study was funded by Apira Science, maker of GroWell.
Hair Regrowth Results for Men
In a randomized, double-blind, placebo-controlled study published in Lasers in Surgery and Medicine (2013), 41 men aged 18–48 with androgenetic alopecia used our 655nm red light device for 25 minutes every other day for 16 weeks. Hair counts rose an average of 67% with the active device, compared with 32% with a placebo device, a 35-point difference (P = 0.003). No side effects were reported. The study was funded by Apira Science, maker of GroWell.
Three ways to read the results
Hair-growth studies report results differently. Here are ours on each common measure.
Change from baseline
67% men · 48% women
Average increase in each active-group participant’s hair count over 16 weeks.
Difference vs. placebo
+35 pts men · +37 pts women
How much more the active group gained than the placebo group.
Hairs regrown per cm²
~30 men · ~35 women
Additional terminal hairs per cm² in the active groups, calculated from the published hair counts.
Better Together: LLLT + Minoxidil
A randomized controlled study of women with female pattern hair loss found that while our low-level light therapy (LLLT) technology and topical minoxidil were each effective on their own, combining the two produced significantly better results and the highest levels of patient satisfaction. The results were published in Lasers In Surgery and Medicine, the official journal of the American Society for Laser Medicine & Surgery.
Doctor recommended BECAUSE WE'RE BACKED BY REAL SCIENCE.
When other products claim they are “backed by science” they are often citing our studies, which is why physicians widely recommend the GroWell Cap to their patients.
Trusted By Dermatologists
“Red light therapy for hair loss works and the GroWell cap is my favorite. It’s safe, FDA-cleared and backed by 20 years of science. And that matters to me, because I’m a doctor.”
Dr. Zena Gabriel
Board-Certified Dermatologist
Pick your color. Start growing!
frequently asked questionS
GroWell is a line of products from Apira Science offering advanced solutions for men’s and women’s thinning hair, including red light therapy caps, shampoo, conditioner, supplements and topical treatments.
Yes, the GroWell line of products use technologies and ingredients that are doctor-recommended and clinically tested for safety and effectiveness. GroWell is by Apira Science, a recognized leader in hair and skin therapies delivering proven results for nearly 20 years.
GroWell is for men and women who want to look their best but are experiencing mild to moderate hair loss or thinning hair.
The GroWell Cap is a standalone treatment that doesn’t require any additional products to be effective. However, many people do combine it with GroWell’s Hair Repair & Restore Shampoo and Conditioner, Topical Minoxidil and Hair Health Supplements to get the benefits each one can offer.
Red light therapy is a non-invasive treatment that uses specific wavelengths of red and near-infrared light to stimulate biological processes in the scalp. This process is known as photobiomodulation, where light energy interacts with cells to enhance their function.
At a cellular level, red light therapy targets the mitochondria (the “powerhouses” of cells), increasing the production of adenosine triphosphate (ATP). This boost in cellular energy helps hair follicle cells function more efficiently, encouraging stronger and thicker hair growth.
You can explore the underlying science in this peer-reviewed review:
https://www.sciencedirect.com/science/article/pii/S1748681520307348
Hair grows in cycles, including the growth phase (anagen), transition phase (catagen), and resting phase (telogen). Red light therapy has been shown to help prolong the anagen phase, meaning hair stays in the active growth stage for longer.
Research using 650 nm red light found it can delay the transition from growth to shedding and stimulate biological pathways linked to follicle regeneration.
Read the study here:
https://pmc.ncbi.nlm.nih.gov/articles/PMC8577899/
Yes, red light therapy doesn’t just target hair follicles—it also improves the overall scalp environment. It can enhance blood circulation, reduce inflammation, and support cellular repair, all of which contribute to healthier hair growth conditions.
Scientific reviews highlight that photobiomodulation triggers multiple physiological responses, including improved tissue repair and reduced oxidative stress.
Further reading:
https://www.mdpi.com/2757414