I've been using this on my mare for the last 4 years (she's now 26) and this has been one of the key items to keeping her looking like she's in her teens. The distributor I was getting it from stopped carrying it. I ordered through Amazon and found that NRS was the source. Another supplement is also no longer carried by the previous distributor and has played a significant role in my mare's rehabilitation. Very happy to have found a place that carries both (and others I might add later) with prompt shipping and reasonable prices!