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I recently discovered a sports drink that is good for people who have dehydration issues due to exercise and age. I run a lot, and sweat quite a bit. The drink is called OS-1 (Otsuka-1) and is available at most drug stores and pharmacies in Japan.

The drink contains water and electrolytes help to maintain a healthy balance of hydration in a person who does not drink enough liquids during the day. I tried it after a running race, and it worked very well for me.

OS-1 has been very helpful to me in maintaining a healthy hydration level before, during, and after exercise. If you are thirsty and feeling a bit tired (either due to the heat or from exercise), I recommend this drink.