I started using Calm Shen a few weeks ago. There was no impact on her digestion, such as upset stomach or loose stool. I started with half the recommended amount and went up to the full amount in 3 days. The product does seem like it could have a bitter or otherwise noticeable taste, but Baby did not give it a second thought when it is mixed in her food (and she is a picky eater!).
I noticed after a couple weeks that Baby's anxious chewing had reduced. She normally will chew on herself when she is separated, or even if she thinks we are going to leave her alone. I noticed the wet chew spots less frequently and she is growing fur back in the couple areas that she was balding herself.