More specifically, exogenous copper supplementation, not copper present in food. So, for those that do not fancy liver, copper supplementation maybe a viable route. Ray has said that 4oz of liver has 30mg of copper, which is our weekly requirement. So, I am taking 4mg copper gluconate daily and will post update in a month. I have some greying hairs that should get color restored from the copper supplementation.
http://www.ncbi.nlm.nih.gov/pubmed/24549041
http://www.ncbi.nlm.nih.gov/pubmed/24549041