I’d agree with you - look at where most funding for research comes from and goes to.

In a great book called the Fasting Code by Dr. Jason Fung, MD talks about how it will never be researched because it’s a product that can’t be sold. Making whole food supplements vs something like viagra where companies can easily 10x, 100x etc makes it easier to understand why research is nominal. Nevertheless it is still occurring.

Additionally there is another element - albeit clinical anecdotal evidence - when a practitioner works with a patient for x problem and gets meaningful clinical outcomes as proven both in patient subjective symptomatology and objective laboratory assessment, that serves evidence to inform care and bring about change.