This is because ghrelin receptors are found in the pituitary gland, where they are called growth hormone secretagogue (GHS) receptors
GLOBAL GLUTATHIONE MARKET SIZE, BY PHARMACEUTICAL, 2018-2032 (USD MILLION) TABLE 81
Where a claim relies on inference from the broader literature, we say so
7 nicotinic acetylcholine receptors (7nAChR) are key receptors for inhibiting inflammation in the cholinergic anti-inflammatory pathway, and there is a correlation between them and RA, while sinomenine can inhibit the expression of 7nAChR and exert anti-inflammatory and anti-arthritis effects through ERK/Egr-1 signaling pathway transduction (68, 69)
Or, take a Vitamin B12 shot only under the supervision of a doctor
In contrast, TB-500 (Thymosin -4) functions as a G-actin sequestering molecule