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L-Histidine is an amino acid that the human body cannot manufacture, hence, it must be obtained from your diet, which is generally deficient, or from supplements which you can purchase
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HISTIDINE (Non-Essential Amino Acid)
Are these two references in conflict? I’m not sure. I see that left and right handed moledcules could act quite differently, but I think we need to clarify before going further what the stated view is. This is a new area to me, so I’m learning as I read, and I just want to make sure I understand the position.