Nicotine presence can be detected in the blood for a short period only (about 48 hours) . However, its metabolite, cotinine, can be detected up to about three weeks from the last use and the cut-off detection levels is 200 ng/ml.
Q: What is the purpose of toner? Our skin is happiest at a pH of 5.5. Toner balances the pH of your skin. If you are acne prone the skin is too acidic. So finding a slightly alkaline toner can help balance the acidic nature. If the skin is dry, it is too alkaline, so finding a toner that has a lower pH can bring it to a happy balance of 5.5. Toning 1 minute after cleansing allows all the beneficial molecules to absorb into the skin as it is still wet.
The second step is to get really comfy and cozy and friendly with toner. Toner is, like the acid mantle, slightly acidic â or it should be, anyway. When I was younger, my sister swore by witch hazel as a toner, and it turns out that witch hazel is the basis of most toners on the market. It has a pH of 3, but a 1:1 solution of witch hazel and water would have a pH of 5. The toner Iâve picked up is from Weleda, which has very-to-moderately acidic witch hazel, lemon juice, and rosehip extract mixed with neutral water and slightly alkaline alcohol as well as non-pH essential oils.