There is no way that anything can build a tolerance to it because of the means of 'attack'. I swear by it, BUT have found it difficult to get to doorstep as an EFFECTIVE functioning product for the majority of times I have ordered it in the past couple of years. Reading back over the LONG thread about it I came to the conclusion that when it wasn't working/symptoms worsened for others, it was probably they had gotten inactive bottle of it also. Early on I never received bottles that were ineffective. I get some serious wounds occasionally, working on various things. I once cut my foot almost to the bone with a pressure washer flub-up, years ago. I rushed inside bleeding like a stuck pig...put my foot up on the bed and wiped the blood away so I could get at the base of the wound and sprayed it a couple of times over a period of a few seconds and it completely stopped the bleeding after the 3rd time. You must understand that when my feet bleed I must do compress method for many minutes to stop the blood flow. That in itself was an exciting thing to me, repeated many times on cuts in differing places over the years. Back to the foot, it healed completely with NO scar in about a week. I was really sold up to that time, there after, I recommended it to all my buddies that were in mechanical trades, IF I hadn't already. My niece was being treated for mrsa? some nasty infection breakout on a handsized spot on her leg by drs and for about two months it wouldn't heal. Gave her a bottle and she spayed it twice a day for a couple days and it was gone. I haven't witnessed anything a GOOD bottle wouldn't kill in a few days use, animal or human. I highly suspect a faulty bottle when it does fail. The reason it isn't widely used is it would put many of the multi-billion dollar industries out of business...that's all I have to say on the matter
Remember, the only thing more evil than the military-industrial complex(besides banking) is the medical/pharmaceutical complex.