L-arginine and implantation

L-arginine, an amino acid supplement might help aid implantation as well as development of the egg and follicle.

"It was concluded that oral L-arginine supplementation in poor responder patients may improve ovarian response, endometrial receptivity and pregnancy rate."
From: Adjuvant L-arginine treatment for in-vitro fertilization in poor responder patients

"Little or none of the cationic amino acids in eggs (i.e., lysine, arginine, and histidine) are lost in exchange for methionine, whereas these amino acids are greatly depleted by methionine in blastocysts...Whereas these data relating transport activity with the essential amino acid content of early embryos are not extensive, they seem adequate to support the conclusion that essential amino acids improve development largely because they are transported into preimplantation embryos"
from: L-tryptophan and Pregnancy, under the subheading "Essential Amino Acids Beneficial to Development"