This does not in any way suggest that similar things might be happening with Covid-19, especially in live humans, but a clinical trial has commenced exploring this
Gastel JA, Roseboom PH, Rinaldi PA, Weller JL, Klein DC
-Systemic Stability and Delivery Versatility BPC-157 retains full biological activity after exposure to gastric juice and demonstrates efficacy via multiple administration routes without requiring a carrier vehicle 2
They control ovulation and get the uterus ready for implantation
You should never have to guess what you are putting into your body
Despite a lack of precise correlates of protection, it is clear that a pan-coronavirus vaccine will need to induce immunity that cross-recognizes the full range of diversity across this viral family