Insects synthesize vitamins...

[kinyonga]

"Insects, however, have the ability to synthesize their own fat-soluble vitamins (A, D, E, and K) from other compounds."..
https://projects.ncsu.edu/cals/course/ent425/library/tutorials/internal_anatomy/nutrition.html

 

[ERKleRose]

Very interesting and informative!

 

[DocZ]

We know they can synthesize D3 and many are synthesizing A from precursors. I was unaware of E and K synthesis, but I don’t know that process at all

most lizards have the enzymes to make vitamin C as well