I have not heard that before so I’ll do some digging into it. Thanks.
Discussion
The secret is in the ingredient list
Citric acid and fulvic acid are safe. Phosphuric acid is not (this ones in all the liquid ph bottles)
Hey guys. I just got some feedback from a brain surgeon/ chemist doctor friend of mine. I was asking about the liquid Ph booster drops. He does not recommend using the drops I use because of the potassium hydroxide. He recommends using good old fashion Arm n Hammer baking soda. I’ll have to play around with it to see what amount to use to get to a neutral Ph of 7. 
Some of us true organic growers know whats toxic!