How to choose hydrogen machines with different flow rates?

Here is a brief introduction to the users of hydrogen machines with different flow rates:
300-600ml is generally suitable for ordinary people's health care, improving insomnia, eliminating inflammation in the body, etc.
900-1500ml is used for auxiliary treatment of cardiovascular and cerebrovascular diseases, some basic diseases and various inflammations in the body.
3000ml is suitable for relieving cancer pain and auxiliary treatment of cancer.
The larger the flow rate, the faster the effect. If used for home health care, it is generally recommended to choose more than 600ml. Customers can see the effect after 3 months of use. If the flow rate is too small, it takes a long time to see the effect, and often there is no patience to persist.