Zelenko’s zinc regimen is huge. 11mg is the recommended daily requirement. I noticed he uses zinc sulfide. I believe that is low absorption and may be the reason. Zinc picolinate might be a better ootion. to get into cells.
The antibiotic Azithromycin is also a large dosage....causes diarrhea in 10% of patients .
There is a lot of different Zinc vitamin on market. Zinc Gluconate, chelated Zinc and as you mention Zinc picolinate.
I have yet to find Zinc phosphate in any over the counter store.