The critic acid and sodium citrate is corn unfortunately and they don’t have to label corn because it’s not part of the top 9 allergen and not mandatory 😭

Yaya, from the JAMA study you refer to: "Taking 60,000 international units (IU) a day of vitamin D for several months has been shown to cause toxicity." No one on this forum is recommending  taking anywhere near that amount. We're talking about 5-10,000IU daily.

"Doses higher than the RDA are sometimes used to treat medical problems such as vitamin D deficiency, but these are given only under the care of a doctor for a specified time frame. Blood levels should be monitored while someone is taking high doses of vitamin D." Quoted from the Healthline article @Yaya linked above...  

https://jamanetwork.com/journals/jama/fullarticle/2748796 If read carefully, this study @Yaya refers to was done on healthy people.   "Meaning  Among healthy adults, supplementation with higher doses of vitamin D did not result in improved bone health; further research would be needed to determine whether it is harmful." "...311 community-dwelling healthy adults without osteoporosis, aged 55 to 70 years, with baseline levels of 25-hydroxyvitamin D (25[OH]D) of 30 to 125 nmol/L."   High dose Vitamin D doesn't have substantial benefits if your Vitamin D level is already normal. High dose Vitamin D is used to restore severely deficient Vitamin D levels to normal levels.  "...high-dose vitamin D therapy, as a useful tool to rapidly replete vitamin D status, may support immune function in the context of an acute or chronic infection" ...and... "Therefore, in the context of inflammation and conditions where anemia is prevalent, including chronic kidney disease, cardiovascular disease, and critical illness, high-dose vitamin D supplementation may be beneficial in rapidly repleting and maintaining 25(OH)D concentrations and may serve as a complement to other treatment regimens to improve anemia." "Among those who had insufficient 25(OH)D (<75nmol/L) at baseline, the High Dose group improved significantly and to a comparatively greater degree on the PRM." These quotes are from the articles I posted earlier.