We use Grapefruit-Seed-Extract at my house for everything. I clean my veggies with it. It is great for the baby''s diaper rash. We keep 5oz with 4 drops by the baby's diapers. When she gets a little rash we just put it on her and the next day it's gone. I use it to ingest about once every 2 months for about 2 wks. to keep my long term candida in check. I alternate with Olive leaf extract caps. Then Whole organic garlic cloves. Then organic ACV. I alternate all these things every few months, so yes I have ingested GSE. The first time I did, I had headache for about a day because of Die off, but that is with any antifungal product usually. I put about 12 to 15 drops in a glass of distilled water or diluted juice and drink 2 or 3 times a day. I have also amazed my dentist by shrinking some gum tissue from periodontal problems. I also use it anytime I have a flar up from getting something wedged in my gums. After discovering Grapefruit-Seed-Extract I haven't had to have any more Antibiotics for infected gums. I avoided peridontal surgery to say the least. So...... Go ahead Ingest it. It's great.