@Beman said "As far as a supplement reptivite is a good one"...I've used it for years. It has beta carotene...a prOformed source of vitamin A in it...which means it won't build up in the chameleon's system and lead to an overdose...but some chameleons may not be able to convert it and need some prEformed vitamin A (palmitate, retinol, retinyl, etc) so you can keep using it and use another vitamin supplement with a prEformed source in it once in a while instead of the Herptivite or you can buy prEformed vitamin A capsules and just put a TINY bit on an insect once in a while. PrEformed sources will build up in the system and are somewhat antagonistic to vitamin D3 so you want to be careful not to overdo the prEformed sources.
BTW...D3 from supplements can build up too which is why we only use it twice a month and let the chameleon produce the rest of the D3 from its exposure to the UVB we provide.
Pre the UVB light when was the last time you changed it? Do you always buy the same brand/type?
Regarding the enroll actin and metronidazole....does your chameleon have
Tritrichomonas or a flagellated protozoan or giardia?