Do you have a reason to suspect your snakes need the supplement?

Insect eating herptiles often do because crickets are generally extremely poor sources of nutrition compared to a wild diet.

Unless your rodents are raised on dry dogfood, I don't think the same issue exists with rodent eating herptiles.
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3.0 WC; 0.1 CB L. getula californiae
0.1 CB L. pyromelana pyromelana
0.1 WC; 10 eggs (7/11) Elgaria multicarinata multicarinata

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