Kalm down Karl.
I'm not debating that a chick has less vitamins than a mouse or a rat or a horse or my left nut. That nutritional link has been posted on this forum alone about 50 times. It does not address what you need to supplement, why you need to supplement or if you even need to supplement. It only provides raw data. Data that is useless unless you know the nutritional requirements for your snake.
The only point I am making is that low is a relative term. It is relative to what the nutritional requirements are for the snake.
If a blood python only needs a tenth of the vitamin A amount a rat provides, should you be worrying that a chick has an eighth of the vitmain A of a rat?
Again, you only need to supplement if chicks are not providing enough vitamins in relation to the requirements of the snake - not in relation to what other prey items offer.
Do you get it now? Or do you want to continue blathering about me and my high horse?