YES!
Here is why;
All along I thought I was supplementing my Jackson's enough, but he apparently developed tongue problems because of a lack of supplementation.
I was perplexed as to how this could have happened. Eventually I figured out it was because I had been giving him degraded vitamins. My vet agreed that this was probably the case. I had the supplements in their original containers in the fridge all along, but the amount I kept in the shake-cup, (until it was used up, around a month or so) was NOT refrigerated.
Since I have been giving him fresh supps., his tongue problem has pretty much disappeared.