I just started taking the BIO X4 yesterday, so I have only had 4 of these supplements. I can tell you that EVERYTHING affects me. Every time I take something new, it will affect me in some way, so I am very sensitive to taking things, but I have not had A SINGLE side effect from these!
By now I would have felt something, and I have felt no adverse side effects. I am also going through some kind of hormonal changes as I am turning 49 in March, so my hormones are changing, and for the first time in my life I have heartburn, and it's completely ridiculous.
I was a little nervous about the green tea extract in the supplements making the heartburn worse, but it has not, and the caffeine content also has not adversely affected me, and I am not a good sleeper, so good news there. I will post again after a month and let you know how it is after a month, but my hopes are high!
Bottom Line: Yes, I would recommend this to a friend
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