Tretinoin may enhance minoxidil absorption, potentially improving hair regrowth when combined with microneedling. Users discuss various treatments like minoxidil, finasteride, dutasteride, and microneedling, with mixed results and concerns about side effects and scarring.
Tretinoin can cause non-telogen hair loss in some men by inducing catagen-like changes in hair follicles and through retinoid toxicity, especially when used with minoxidil. Some users report hair loss even when using retinoids on the face, while others experience benefits when combined with treatments like finasteride and minoxidil.
Tretinoin and microneedling both enhance hair growth through different mechanisms, with microneedling being considered safe for long-term use. Optimal microneedling needle length varies, but 0.8 mm is suggested for hair growth, and a Dermastamp is recommended to avoid skin damage.
Tretinoin may enhance the effectiveness of minoxidil for hair regrowth by increasing enzyme activity and skin permeability, but its standalone impact is limited. Some users experienced improved hair growth with tretinoin, while others found it worsened their condition.