Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Effective without side effects

My bloodwork always shows borderline anemic, so I've taken iron supplements since I was a teenager. I've probably tried a dozen different types of iron supplements, and the Solgar "Gentle Iron" product is the first one that has been effective and has not had some undesirable side effects, such as constipation. My last few iron counts have been good - in the low normal range, according to my doctor.If you've had trouble finding a good vegetarian iron supplement, "Gentle Iron" is definitely worth trying.