Disclaimer: I run Wyndly (https://www.wyndly.com/) a YC-backed startup that uses sublingual immunotherapy, among other allergy treatments, to help people breathe better.
Also it is much less regulated as its not fda approved, so the quality you are getting is less certain than shots. I would not be surprised if the majority of SLIT use cases in the US are placebo due to cost constraints outside of the fda approved tablets covered by insurance. Yes studies is one thing and its shown clearly that its comparable, but you need the right concentrations
TBH I am skeptical of startups that operate in this type of environment as theres not enough oversight. For me to be comfortable it would need to be very transparent what is going into the mix
source: https://fairfieldcountyallergy.com/whats-the-story-on-allerg... "Sublingual immunotherapy is not currently covered by health insurance companies in the United States because it is ineffective as it is done here"
At Wyndly, our protocol follows the academic research. I'll work on making this more explicit.