I know two kinds, both run by hospitals. One is a small yellow bottle, which you can eat directly after buying it, one or two capsules a day, which has great side effects, but it doesn't rebound as soon as it takes effect. If you are afraid of discomfort, take one pill for a few days to get used to it.

The other is opened by the hospital according to physical fitness. The real product has a Thai hospital card, and then it is taken in the morning and evening. Many pills are taken twice in the morning and evening. The side effects are small and the price is more expensive than the small yellow bottle. I didn't lose weight that fast, nor did my friends buy it and eat it.