Eflornithine blocks the action of an enzyme called Ornithine Decarboxylase inside hair follicles. This enzyme is part of the pathway hair follicles use to produce new hair. Blocking it slows the rate at which follicles can grow new hair — meaning new growth comes in more slowly, often finer and lighter.
This is the same mechanism Eflornithine contributes in HairlessHype. For the full picture of how the mechanism plays out — including timeline expectations and what Eflornithine isn't designed to do — see "How does HairlessHype work for hirsutism?"
What's different in Eflornithine 12%:
- One mechanism, one ingredient. Eflornithine 12% works through the Eflornithine pathway alone — without the additional effects from Azelaic Acid (which weakens the hair shaft and evens skin tone) or Metformin (which addresses local inflammation and localized androgen activity).
- Better suited for women whose skin doesn't need additional support. If you don't have surface acne, uneven skin tone, or significant inflammation in the treatment areas, you may not need what the additional ingredients in HairlessHype provide.
- Easier to layer with other actives in your routine. The single-ingredient simplicity often makes Eflornithine 12% the more practical choice if you're already using Tretinoin, Salicylic Acid, or other topical actives in the same area.
For women with PCOS or PCOS-pattern hormonal symptoms whose unwanted facial hair is the primary concern — without the surrounding skin issues — Eflornithine 12% delivers the hair-growth-slowing mechanism in its most targeted form.
Your Oana clinician will discuss whether Eflornithine 12% or HairlessHype is the better fit for your specific case.