== Warnings ==
While undecylenic acid (and to a lesser extent, apple cider vinegar) burn sensitive skin, they are not causing damage. Garlic, tea tree oil, and oil of oregano can damage tissue. If the vagina's tissue are healthy enough, and most people's are, it should not be of concern, but please be cautious and use common sense. Try a little at a time, build up, and listen to your body. Neem oil and coconut oil can be used as a base for other more irritating ingredients like the tea tree oil (you can also crush garlic into neem or coconut oil). For most people, undecylenic acid is typically the most painful of the recommendations, but it also is faster and more effective than any other we know of. And, even though it burns, we don't know of any reports of damage to the skin.
== References ==