>>If i cut off the stinger of a wasp, can i feed it to me leo without any adverse side effects?
>>

Please don't do this. Even if it's otherwise safe, you can't guarantee that the wasp doesn't have parasites or pesticides in or on it that could harm your gecko.
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0.1 Albino Leopard Gecko - Tigger
0.1 Crested Gecko - Pooh-Bear