I am 7 months pregnant and have had severe sinus problems the entire time. Nothing OTC works for me including Benadryl or Tylenol Sinus. I've tried the Vick's Vaporizor and nothing. Afrin gives some relief but I think I've become immune to it. I've been using it for months and at increasing intervals throughout the day. So after reading all these positive comments about drinking the ACV with water, I thought I'd try it. I mixed about 2 tablespoons of ACV with 8 ounces of warm water and drank it. It tasted a little like lemon tea with no sweetener so I didn't find the taste to be terribly off-putting; however it's been about 2 hours and NO difference at all in my sinuses. I may try it again and see if it does anything with repeated use, but so far, I am not getting any effect at all from this remedy.