Using them on their own is usually better because it gives more flexibility. You might find that 1mg of one and 1mg of the other suits you, or perhaps a lower amount of the first with 1mg of the second. Blends force you into whatever ratio the maker chose. If sides show up from one, you can simply stop that one instead of having to drop both.
The GLOW product hasn't helped with my pain or skin at all. I'm still looking for something that works, mostly for shoulder and elbow issues. Are the Wolverine blends worth trying, or should the two be used on their own?