There is the Durvet brand on Amazon, apple flavor. Bought 2 packets. Content is like clear toothpaste. content is 6.07g at 1.87% conc, so about 110mg for round numbers in the tube. dose is about 12-20mg for body weight 130 - 170lb for humans. So about 6-9 dosage in that packet for me. I didnt bother to be exact on the math as the overdose margin is very wide.
Personally took 2 doses 7 days apart and so far no known side effects. Will take another 2 dosage in about mid January.