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.
How to Use a Skin Toner. Once you have selected the proper toner for your needs, you can start the skin care routine: Step 1: Wash the skin thoroughly with a cleanser or mild face wash. Step 2: Pat the skin dry. Do not scrub with a towel or washcloth as this can cause irritation. Step 3: Apply a small amount of your toner to a cotton pad or ball. Avoid dipping your cotton in the toner as this can leave streaks or contaminate your product. Step 4: Use a gentle stroking motion to apply the toner to your skin.