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What is the best laser cap for hair growth? 

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The 800-nm diode laser is an efficient and safe technique for hair reduction.
Our results indicate that a larger spot size appears to be more effective for laser assisted hair removal.
The long-pulsed alexandrite laser is safe and effective in reducing hair growth.
Sevaral clinical reports [1–3] have suggested that hair growth is omoted by low-level laser therapy (LLLT), defined as therapy using d-beam or near-infrared laser with a wavelength of 600–1100 nm d an output power of 1–500 mW, since Mester et al.
This 800 nm diode laser with a chilled sapphire tip and variable pulse duration is safe and effective for long‐term hair reduction in individuals with skin types II and III.
This pilot study showed that a 1,550‐nm fractional erbium‐glass laser might induce hair growth, but more intensive studies are required to clarify the clinical applications of this treatment.
Overall, the results indicated that low-level laser therapy (LLLT) with a 830-nm wavelength resulted in greater stimulation of hair growth than the other wavelengths examined and 785 nm also showed a significant effect on hair growth.
This meta‐analysis strongly suggests that minoxidil, finasteride, and low‐level laser light therapy are effective for promoting hair growth in men with androgenetic alopecia and that minoxidil is effective in women with androgenetic alopecia.
Laser or light-assisted hair removal offers an efficient way to permanently reduce excessive hair growth.
conclusions Diode laser treatment rarely stimulates terminal hair growth.

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