About this Video

• Video Title: Microneedling: The BEST Needle Size For Hair Regrowth (2024 Update)
• Channel: Perfect Hair Health
• Speakers: Rob English
• Duration: 00:13:25

Introduction

This video discusses a new study on microneedling and its effectiveness for hair regrowth. The speaker, Rob English, a researcher specializing in hair loss, presents findings that challenge previous assumptions about optimal needle length and penetration depth for microneedling treatments.

Key Takeaways

• Optimal Needle Length: A recent study suggests that shorter needles (0.5 mm) are more effective for hair regrowth than longer needles (1 mm or 1.5 mm) when using an automated pen device. This contradicts earlier findings suggesting deeper penetration is better.
• Penetration Depth vs. Needle Length: The video emphasizes that needle length doesn't directly equate to penetration depth. Factors like user pressure and needle angulation affect how deep needles penetrate the scalp. Automated pens provide more consistent penetration.
• Wound Depth and Hair Growth: Microneedling's effects on hair growth vary depending on the depth of the wound. Penetration into the dermis (1-2 mm) promotes drug penetration and wound healing, while deeper penetration may not be necessary and could delay healing. Wounding just above, but not into, the hair follicle stem cell bulge (approximately 0.6-0.8mm) might be optimal.
• Bleeding Not Necessary: The study showed that minimal bleeding is associated with the most effective treatment. While some microvascular rupture might occur at the optimal depth, significant bleeding is not necessary for positive results.
• Study Limitations: The study is small (15 participants per group) and lacks a control group, so results should be interpreted cautiously. More research is needed to confirm these findings.