From the Research
Optimal Needle Length for Microneedling in Hair Regrowth
The optimal needle length for microneedling to promote hair regrowth is a topic of ongoing research. Based on available studies, the following points can be noted:
- A study published in 2021 1 compared the effects of microneedling with two different depths of penetration (0.6 mm and 1.2 mm) on promoting hair growth in patients with androgenetic alopecia (AGA). The results showed that microneedling with a depth of 0.6 mm was more effective than minoxidil monotherapy in terms of hair count and hair thickness.
- Another study published in 2020 2 used microneedling with an unspecified needle length to treat patients with AGA and telogen effluvium (TE). The results showed a partial or complete reduction in hair loss, associated with an improvement in hair density and thickening of the hair shaft diameter.
- A comprehensive review of microneedling published in 2017 3 discussed the indications for microneedling therapy, including alopecia, but did not specify the optimal needle length for hair regrowth.
- A study published in 2022 4 discussed the benefits and technical considerations of microneedling, but did not focus on hair regrowth or specify the optimal needle length for this indication.
Key Findings
- Microneedling with a depth of 0.6 mm may be more effective than minoxidil monotherapy for promoting hair growth in patients with AGA 1.
- Microneedling can be used to treat AGA and TE, with positive results in terms of hair density and thickening of the hair shaft diameter 2.
- Further research is needed to determine the optimal needle length and treatment protocol for microneedling in hair regrowth 5, 1, 3.