L-histidine as a chelator?

[Guest guest]

I was wondering what Mr Cutler thinks about

the amino acid L-Histidine as a chelator.

I have read on a few sites, that histidine

chelates copper, zinc, nickel, cobalt.

I wonder whether it can chelate copper, mercury

and maybe lead effectively.

Thanks in advance for any info.

Greetings,

Ali