Wow... I sure didn't mean to offend you....
No offense taken at all. I'm here to learn.
It has not been proven that chams can convert provitamin A (carotenoids that serve as precursors of retinol) to vitamin A.
To quote Ferguson in this article: """""Whether and under what conditions panther chameleons can "do the vertebrate thing" and convert carotenoids to useable vitamin A in their gut needs to be investigated experimentally."""""
He's not referring to Retinyl Palmitate or human supplements here. He's talking about beta carotene.
In that same paragraph he said "These symptoms could be relieved with oral dosages of over the counter vitamin A supplements (probably retinyl palmitate) suspended in vegetable oil.
Reference:
http://healthlink.mcw.edu/article/980793489.html
** Provitamin A carotenoids such as beta-carotene are generally considered safe because they are not traditionally associated with specific adverse health effects. The conversion of provitamin A carotenoids from plant foods to vitamin A slows down when body has adequate stores of Vitamin A, so the levels are naturally limited. A high intake of provitamin A carotenoids (from food sources) can turn your skin yellow, but this is not considered dangerous to health.
I never said chams don't need preformed vitamin A as I know they do, I just choose to supply it via natural means as opposed to synthetic forms.
Vitamin A can be lost from foods during preparation, cooking, or storage.
In my opinion, you would need a ton of research to provide a natural source of Vit A because the chicken does not only contain Vit A it also contains the following:
100 grams of Chicken, broilers or fryers, breast, meat only, cooked, roasted
Protein & Amino Acids
Amounts Per Selected Serving %DV
Protein31.0g 62%
Tryptophan 362mg
Threonine 1310mg
Isoleucine 1638mg
Leucine 2328mg
Lysine 2635mg
Methionine 859mg Cystine397mg Phenylalanine1231mg Tyrosine1047mg Valine1539mg Arginine1871mg Histidine963mg Alanine1692mg Aspartic acid2764mg Glutamic acid4646mg Glycine1524mg Proline1275mg Serine1067mg Hydroxyproline~
Vitamins
Amounts Per Selected Serving%DVVitamin A21.0IU0% Retinol6.0mcg Retinol Activity Equivalent6.0mcg Alpha Carotene0.0mcg Beta Carotene0.0mcg Beta Cryptoxanthin0.0mcg Lycopene0.0mcg Lutein+Zeaxanthin0.0mcg Vitamin C0.0mg0%Vitamin D~ ~Vitamin E (Alpha Tocopherol)0.3mg1% Beta Tocopherol~ Gamma Tocopherol~ Delta Tocopherol~ Vitamin K0.3mcg0%Thiamin0.1mg5%Riboflavin0.1mg7%Niacin13.7mg69%Vitamin B60.6mg30%Folate4.0mcg1% Food Folate4.0mcg Folic Acid0.0mcg Dietary Folate Equivalents4.0mcg Vitamin B120.3mcg6%Pantothenic Acid1.0mg10%Choline85.3mg Betaine6.2mg
Minerals
Amounts Per Selected Serving%DVCalcium15.0mg1%Iron1.0mg6%Magnesium29.0mg7%Phosphorus228mg23%Potassium256mg7%Sodium74.0mg3%Zinc1.0mg7%Copper0.0mg2%Manganese0.0mg1%Selenium27.6mcg39%Fluoride~
Sterols
Amounts Per Selected Serving%DVCholesterol85.0mg28%Phytosterols~ Campesterol~ Stigmasterol~ Beta-sitosterol~
Other
Amounts Per Selected Serving%DVAlcohol0
PLUS - plus you would need to still give him a wide assortment of insects.. snails, arachnids, butterflies.. etc..
All I am saying is preformed Vitamin A does not HAVE to come via human supplements...
I agree it doesn't but like the article said "housing & caring for a
WIDE variety of insects requires knowledge and is expensive and time consuming" and doing it the natural way requires research