Medication interactions: Anyone on prescription medications should discuss potential interactions with healthcare providers before starting peptide protocols
(5) M V Graf, A J Kastin, D H Coy, and A J Fischman (1985) Delta-sleep-inducing peptide reduces CRF-induced corticosterone release Neuroendocrinology, 1985 Oct, Volume 41 (Issue 4), Pages 353-6
Cysteine is a very popular target for site-directed labeling experiments to investigate biomolecular structure and dynamics
So the capsule-vs-sub q question for most peptides isnt a preference its forced by molecular weight
L. I. Fedoreyeva, I. I. Kireev, V. Kh. Khavinson, and B. F. Vanyushin, Penetration of short fluorescence-labeled peptides into the nucleus in HeLa cells and in vitro specific interaction of the peptides with deoxyribooligonucleotides and DNA, Pleiades Publishing Ltd, Nov. 2011. doi: 10.1134/s0006297911110022