Probiotics

My daughter is 6 weeks old and is exclusively formula fed. She is on enfamil gentlease but has wicked bad gas pain. We have tried gas drops and gripe water and it doesn't really seem to help. She is also on Zantac for her acid reflex but I have heard good things about Gerber soothe probiotic/ colic drops. I was wondering if anyone has tried them? Looking for anything to help our little girl as she is in a lot of pain. Sometimes it's so bad she won't even take a bottle. Just looking for some help!