l glutathione tripeptide 3 (a) The acts as a cofactor in various Source Naturals L Glutathione -

Reduced Tanning Sun-induced pigmentation often improves over time

MK-677 works through that same ghrelin-receptor pathway but is chemically a small-molecule compound, not a true peptide, even though bodybuilding content routinely groups it with the others

The article in AP came out today

There are specific conditions needed for an efficient ADCC or CDC, including enough number of antibodies attached to the target cell, a sufficient number of effector immune cells (such as natural killer [NK] cells, monocytes, and granulocytes), and the absence of ADCC suppressor cells (such as regulatory T cells [Tregs] and myeloid-derived suppressor cells [MDSCs]) in the tumor microenvironment

If you want to explore more options built around absorption, the Natural Immunity Supplements & Vitamins collection is a helpful place to browse