I've been supplementing glucosamine along with a large amount of other things for awhile now. I'm not too bullish on it in humans, but it doesn't seem like it hurts, and is definitely cheap: https://nearcyan.com/supplements
My latest favorites that I'm a bit more hopeful for are glycine, spermadine, and rapamycin.
My latest favorites that I'm a bit more hopeful for are glycine, spermadine, and rapamycin.