Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Headache and taste

I noticed a correlation between taking this and within 30 minutes getting a headache. Also, the taste (even the minimal serving size) was unpleasant. I give it 2 stars because I think the intent behind the product is good for those of us who like purified water and remove all the minerals. Overall, I was willing to get over the taste but not the headaches!