Both ginger and turmeric are generally considered safe and without significant side effects, and both are available as capsules from health-food stores. However, each may interact with certain prescription medications, and neither should be taken if you are pregnant. Do not self-treat with either ginger or turmeric.
Think of the leather in your car as skin that needs to be cleaned, conditioned, and protected to maintain a healthy appearance. Similar to our skin, if we do not take care of leather, it will dry, crack, and eventually break over time. Wrinkles in leather are caused by environmental stress, heat, or damage from regular wear and tear.
Use a microfiber cloth to buff the seats. Once the conditioner has had a chance to soak into the leather, take a clean dry microfiber cloth and polish the seats. Use circular motions and take care to wipe up excess conditioner. Don't over-condition your leather seats. Most seats only need conditioning treatment a few times a year.