For the leaky gut, whom should I start with and what to ask for? Any scans or blood work to start with? I have been taking high dose 50000iu supplements of D since 2017. No changes though. Then Rheumatologist started me a medicine called calcitriol. It's an active form of D. I am taking high dose of D along with this calcitriol. Taking this combination since Jan 2022. No changes in values but he told me to keep taking it. I am not sure if my body is not absorbing D. How do I start to check the gut? Any symptoms to look for?