Choosing the best tea tree oil depends a lot on what you want to use it for and whether or not you have sensitive skin. Skin type is a factor because this oil is an antiseptic and can cause a reaction for those with sensitive or dry skin. Finding an oil that is made organically might also be something you want to consider.
Tea tree oil has been found to be a natural antiseptic, and many people use it for acne or oily skin, as well as bacterial and fungal infections. If you are going to use it for this purpose, you'll want to choose an oil that contains a high amount of terpinen-4-ol, which is the ingredient in tea tree oil that has antiseptic properties. Some manufacturers will list the percentage of terpinen-4-ol on the bottle, but others might not. If the latter is the case, you can try contacting the company directly.
If you have sensitive skin, a higher concentration of terpinen-4-ol can cause a reaction in some, so you should test the oil on a small patch of skin on your arm or leg first. Use oil with a lower percentage of terpinen-4-ol first, and then test one with a higher percentage if you don’t have a reaction. If you have a known severe skin sensitivity, consult a dermatologist before testing tea tree oil on your skin.
Some manufacturers of tea tree oil mix it with other ingredients, such as eucalyptus oil. Although this might smell pleasant, it may not be as effective at treating acne or other forms of infection. However, it can be one way to avoid the harsh properties of the oil. To ensure you are getting the amount of tea tree oil you desire, check the label for additional ingredients before you make your purchase.
Some brands of tea tree oil come in clear bottles, which is convenient because you can tell how much of the oil you have left. The disadvantage is that the exposure to light can break down the oil, making it less effective, and create a byproduct that may irritate the skin. Avoid this problem by purchasing oil that is stored in a darkly-colored bottle.
If purchasing organic products is important to you, check the label on the bottle to ensure it is certified organic. Most countries have a specific seal or marking that certifies it as organic to avoid manufacturers making false claims. Tea tree oil is usually readily available at health food stores, skin-care stores and online.