General lifespan is 12 Months. We have seen them last longer, but also less. It is dependent on the individual as to how quickly your body draws on the disk.
They can take up to a month to take full effect, but for some the effects can be a few days to almost immediate.
Our product is proved to have an effect. How it will work on you we cannot say. We are all individual, and the results can be from subtle to substantial. We have a decade of testimonials for pain, swelling, balance, muscle fatigue, flexibility, energy, sleep, moods, menopause and anxiety to name a few. But you may find yourself buying for one reason and it help another.
No they are better with a little room, so that you can fit your full index finger between the band and your wrist.