Xisca
Member
said there was a potential problem, especially with older animals, of heavy metal accumulation.
So now I tend to limit my cooking time to 2-3 hours, maybe 4, and I don't re-use them.
There is much more gelatine in a Young animal, and I use organic chicken and lamb.
And yes I reuse the bones each day with new veggies as long as the taste makes me feel I still get some nutrients from it!