Several claims have been authorised for muscle and joint health. These include:-

Health claim – ‘contributes to…’
Normal muscle function Calcium, Magnesium, Potassium, vitamin D*
Growth in muscle mass Protein
The maintenance of muscle mass Protein
The maintenance of normal connective tissue Copper
The formation of normal connective tissue Manganese
Normal sulphur amino-acid metabolism Molybdenum
*A claim may be made for a single nutrient or several nutrients

Glucosamine, chondroitin and fish oils do not have claims authorised in this area but are widely used with joint health in the mind of the consumer, and may materialise in the future.