Peptides for hair removal or hair loss: what the evidence says

What did @americanfille actually say?

She claimed that using an at-home IPL (intense pulsed light) device every other day for one month produced near-total hair removal in her underarm and bikini area, to the point where she hasn't needed to shave in a week. She described it as "peak hair extinction" and compared results to Kim Kardashian's famously smooth skin. She also said bikini wax gave her ingrown hairs, and that shaving only lasts two days for her.

To be clear about the device: she never names it. She calls it "the zappy one" and "like a little laser" with a cooling effect. Based on context and product timing, this is almost certainly an IPL handset, not a true laser. That distinction matters, as we'll get into.

Does the science back this up?

Partially, yes, but with important caveats about timelines and expectations. At-home IPL devices do have real evidence behind them, more than most beauty gadgets, but the "peak hair extinction" framing oversells what the technology actually delivers.

IPL works by emitting broad-spectrum light that targets melanin in the hair follicle. The heat damages the follicle and disrupts the hair growth cycle. Because hair grows in phases (anagen, catagen, telogen), you have to treat the same area multiple times to catch follicles at the right stage. A 2020 review by Yin et al. in the Journal of Cosmetic Dermatology found that home-use IPL devices produced significant hair reduction after 3 to 6 months of consistent use, with most studies showing 70 to 90 percent reduction rather than complete elimination. One month of every-other-day use is on the short end of what the literature supports for lasting results. A 2006 randomized controlled trial by Lanzafame et al. in the Journal of Clinical and Aesthetic Dermatology confirmed meaningful reduction after multiple sessions, but emphasized that results plateau and require maintenance.

So her results are plausible, especially in areas with coarser, darker hair like underarms. But "they're gone, they're absolutely gone" probably isn't the whole story long-term.

What did they get wrong (or right)?

She got the core mechanism roughly right: IPL disrupts follicles through light-based heat, and devices with cooling technology do reduce discomfort. Credit where it's due.

What she got wrong is calling it "like a little laser." This is a common and genuinely misleading mix-up. IPL and laser hair removal are not the same. Lasers emit a single coherent wavelength targeted precisely at melanin. IPL scatters a broader light spectrum. True laser systems (Nd:YAG, diode, alexandrite) used in clinical settings have stronger evidence for permanent hair reduction per session. The FDA classifies home IPL devices differently from medical lasers. Calling IPL a laser leads consumers to expect laser-level results on a laser-level timeline, which sets up disappointment.

She also described using the device "every other day for the past month." Most manufacturer protocols and dermatologist guidelines recommend once every one to two weeks per area, not every other day. Over-treating skin with IPL can cause burns, hyperpigmentation, or paradoxical hypertrichosis (yes, that's a real side effect where hair actually increases) in some skin tones. A 2011 paper by Wilken et al. in Dermatologic Surgery flagged this risk specifically for darker Fitzpatrick skin types. She doesn't mention her skin tone or discuss this risk at all.

What should you actually know?

At-home IPL is a legitimate tool for hair reduction, but it is not permanent and it is not for everyone. The evidence supports meaningful reduction in people with lighter skin and darker hair, because the device needs melanin contrast to work safely. Yin et al. (2020) and a 2015 systematic review by Wat et al. in Lasers in Medical Science both flag reduced efficacy and increased risk for darker skin tones (Fitzpatrick IV-VI). If that's you, a board-certified dermatologist using a true medical-grade laser with proper settings is the safer, more effective path.

Her note about waxing causing ingrown hairs is worth taking seriously. IPL and laser hair removal do have a better track record for preventing ingrowns than waxing or shaving, particularly in the bikini area. A 2015 study by Desai et al. in the Journal of the American Academy of Dermatology found laser hair removal significantly reduced pseudofolliculitis barbae (ingrown hair bumps) in the pubic region. So that part of her experience is well-supported.

One more thing: one week without shaving after one month of use is a real result, but it is not the finish line. Hair grows back in cycles. Most people need 6 to 12 months of sessions for sustained reduction, plus periodic maintenance treatments. Declare victory after one month at your own risk.