Nature's Guardian - Three Week Update

So after first applying the Nature's Guardian to Ruki, the smell dissipated after 2-3 days. (Unfortunate because I kind of liked her smelling good.) She still felt a little oily where we applied it for a few days after that, with dust sticking to her fur. Then she started getting dandruff flakes--and after some examination this is what it was. Her skin wasn't flaking; it was just the dander she was naturally shedding was now clumping. 

The dandruff lasted for about a week, and now three weeks later she's back to completely normal. No fleas or ticks, but we also live in the city where that's not really a problem, and I've probably only taken her to the park/woods four or five times since. She hasn't been to the park to play with a mess of dogs, only the occasional passerby here and there, so little chance of getting fleas from other dogs--and in our neighborhood, honestly, little to no chance period because of how the owners care for their own dogs.

So far, a positive review. I only question whether the Nature's Guardian is effective at all, just because we live in such a low-risk situation. It's messier than the Frontline, but so far much safer and much cheaper.