Optima Glucosamine Joint Complex Gel (125ml). Optima Glucosamine Complex is a carefully designed formulation for soothing massage.. Formulated with glycosaminoglycans, a source of glucosamine which is well documented for its positive effect, we combine this active ingredient with devil’s claw, MSM, menthol and natural essential oils.. Initial application creates a pleasant, cooling effect due to the menthol content, whilst the essential oils result in a sensation which is comforting to the skin. Optima Glucosamine Complex smells pleasantly fresh, is non-greasy and absorbs immediately.