Bee pollen

From UroWiki

Bee pollen (Wikipedia link) is a natural appetite stimulant. If you try feeding it to your uromastyx, you may find that the lizard may or may not be interested - it varies with the individual. Bee pollen is a good source of vitamin, but should be limited to once a week at most, as it is high in vegetable proteins. Additionally, if you feed a lot of flowers (primarily during spring/summertime), you need not use it as often.

Bee pollen as a superficial remedy

The use of bee pollen by some may be bypassing a serious underlying issue, which is why the lizard’s diet need stimulated in the first place. Lack of appetite can be due to more prosaic reasons - acclimatisation, brumation - or it can also be due to serious issues, such as impaction, parasitic infection (you should a stool sample checked at least once a year at the vet), incorrect husbandry (temperatures, diet, UVB, and so on). If it’s been eating well before and has recently become picky, that’s usually a warning sign, if it can’t be attributed to something like acclimatisation or brumation.

It is important to remember that the uromastyx is a wild animal living indoors; if it’s hungry, it’ll eat, and if it doesn't eat (which will be in conflict with one of its most basic instincts), that’s usually a sign that something is abnormal and an indication that you should check the basic things listed above.