Strong hair starts at the follicle. Focused laser light and near-infrared reach beneath the scalp surface to support the follicle environment, helping hair feel stronger and more resilient over time.
Support follicle strength at the root
What research says about light, the follicle and strand thickness.
What research shows
A 2024 systematic review of 58 studies found low-level light therapy associated with increased hair diameter, meaning thicker individual strands.
Why it works
Follicle cells absorb red light and use it to support their energy production, helping them stay active and produce stronger strands.
Relevant wavelengths
Lasers keep 650nm light focused as it travels into the scalp; 850nm near-infrared also reaches deeper towards the root.
Read the guide: LED vs. Laser for Hair Regrowth · The Scalp Wellness Glossary
References: Jafari et al. 2024 (systematic review) · Lanzafame et al. 2014
FAQ
Red and laser light support the follicle environment where each strand forms. Over a consistent routine of several months, many people notice hair that feels stronger and breaks less. Results vary.
Laser light stays focused as it travels, and near-infrared reaches deeper. The 7HW StrandElite uses 208 lasers; the 7HW StrandPro pairs 46 lasers with 60 LEDs; the 7HW StrandAir combines red and near-infrared LEDs.
Light supports follicles that are still active. Long-smooth areas usually have few active follicles left, so the best results are where thinning is still in progress.
