I had taken AlgaeCal and Strontium years back and it did not do enough for me and still needed the meds. I still take AlgaeCal (it's been a good 10 years) along with my osteoporosis meds as the calcium does not bother me as do other calciums. AlgaeCal claims that people can build bone just by using their products, I did not have that experience, but I do think that AlgaeCal - actually I use AlgaeCal Plus - is a good product but expensive.