Like Pacemaker said, this is a question for the pharmacists. And do go and ask them, this is what they are really good at doing and there is a push on to get people to use them more.
Having said that, if you can't take Glucosamine, don't worry. I have tried it and it made no difference to my joints. There is research that shows for a lot of people it is no different to a placebo. cochrane.org/CD002946/MUSKE...
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