Does Glucosamine Really Help Your Joints Heal?

I have been having pains in my shoulders. I’m trying to keep active but it seems that my sleep is being disturbed on a nightly basis because of aching in my shoulders and I cannot find a good resting place without some pain at night. I heard Glucosamine can help heal joints that are suffering from damaged ligaments and tendons. There are a few different kinds out there. I would like to hear from people who are trying it, which type your are taking, if it really is helping you and where you get it at a reasonable price. Please be specific. Thanks!