overall vs in general

Please take a look at these two sentences:

1. This medicine can help your health in general.
2. This medicine can help your health overall.

From 1., I can know that my health can improve in most parts. But, I can’t say the same about 2..

I checked "overall", which can mean "general", or "all things and circumstance considered". In view of this, 2. seems very ambiguous.

Could someone help explain?