I have not used KLOW before, but I have certainly profited from two of the active ingredients in the KLOW blend, BpC and TB-500. There will always be naysayers who find it hard to acknowledge objective reality. There may also be liars who falsely claim their results. For me, Wolverine objectively improved my left shoulder [cursed with a torn rotator cuff and biceps tendinosis], where range of motion is now near ninety percent. Here, there are folks who have posted their before-and-after images of KLOW usage. You could say that they are fake/AI or whatever, but when hundreds and thousands of people have claimed to see benefits from something, it gets harder to deny the veracity of their assertions. That said, there will still be folks who say, "There is no evidence of it working in human trials" or something similar. But at the end of the day, it's pretty much like any other medicine. It may work for some people, and not for others. Then, about it being dangerous, sure, that's plausible, but so is anything in excess. Even Acetaminophen is hepatotoxic and can lead to overdose.
Looking at it logically, if used for systemic effects, I would limit the duration of usage. If the worry is about unwarranted effects in other areas, I look at it this way. The metabolic signaling disruption that is caused by injuries is one of the main reasons why so many drugs affect only the injured area. Hence, it is logical to suppose that even KLOW will do the same at moderate doses.
I don't know if that answered your query, but to summarize, KLOW hasn't caused many known fatalities and seems relatively safe. Thus, only you could ascertain if it works for you or not.