Ask the Nutritionist: Dr. Getty's Forum for Equine Nutrition
Welcome to my forum.
Here you will find more than 6 years of questions and my answers. It is searchable and offers a great deal of information.
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All the best,
Dr. Getty
Hi Judy,
Actually, 17 is not all that old and she may not need a joint supplement. Certainly if she is not showing any arthritic symptoms, I would stick with the Glanzen Complete. The omega 3 fatty acids (from flax) go a long way toward lessening any inflammation. And the extra vitamin C is also important. In fact, for aging horses, I often simply recommend flaxseed meal (for omega 3s) and vitamin C (for collagen production -- the protein found in joints and bones) as a means of keeping the joints healthy. Additional supplementation is likely not necessary in your case.
As she ages, you'll want to add more vitamin C (since she loses her ability to produce this vitamin as she gets older). But for now, the extra vitamin C in Glanzen Complete is sufficient.
All the best,
Dr. Getty 
Author of Feed Your Horse Like A Horse
Thanks, Judy
Where are you from? Bayfield, CO