I take Glucosamine every day and have for at least 5 years, maybe longer.
I use Osteo Bi-Flex brand, I have tried cheeper brands & can tell you for me they don't work.
My need is extreme as I have a knee full of arthritus, bone on bone contact and a knee replacement in my near future.
I can tell by feel if I forget to take my pills for a couple days.
Glucosamine works for me, I couldn't sheep hunt without them!
High5