D3 toxicity Is really hard to overdose them on these things. 9 times out of 10 people don’t give them enough supplementation which causes them a lot of health issues later down the road however when you Dust your insects you just want them lightly coated you don’t want it Caked on them. Just a pinch of the powder. Supplementation and UVB go hand-in-hand that’s Why UVB is so important it aids in the D3 process. If you have adequate UVB your good to go. There are a few insects that are just so high in calcium there’s no need to dust them. Like bsfl, Silkworms is another.