Zilla Calcium Supplement food spray.
It says the guaranteed analysis: calcium(min)....1700ppm
Ingredients are: water, calcium gluconate, calcium carbonate, calcium chloride, potassium sorbate, sodium benzoate, and Xanthan gum.
I don't dust my crickets. I dust the greens and alternate days between the multivitamins and calcium. I have been using calcium powder.
My beardie, Ra is a year and a half. I feed him 4-5 crickets daily.