Good info from Davo86 up there. Sera is a well respected company, leaving me every reason to believe Toxivec at the least would fall in line with the other straight Na Thiosulfate products. Still, I've not seen it on any of the comparison reviews that are out there, so I wouldn't be able to conjecture about other functions beyond the basic dechlor/dechloram.
I'm going to differ slightly from OM47 here, although its mostly based on thread reading and only a tiny bit on experience. First of all, I agree that greater concentration and therefor lower expense is the primary reason Prime gets recommended a lot and used by a lot of us, me included. However, I've become somewhat convinced by threads here on TFF and even on some other sites that Prime really does do a better job at some of the add-on functions (even though I agree a big part of adding any of those functions is to promote sales of the product.) Its just that I've stumbled across any number of posts (mostly this was a couple of years ago) where members related glowing reports of Prime having helped (in the temporary way, which is all that can be expected) with the whole business of neutralizing all three toxins (ammonia converted to ammonium, nitrite and nitrate toxicity somewhat neutralized.) Of course, it should always be warned that any conditioner that helps with this can only do so for at most a 24 to 48 hour period, and Prime is no exception, but this can be useful when ammonia spikes because of a gravel clean and the conditioner is dosed in the return water. It can also be useful in other sorts of minor emergencies.
I did also experience some immediate improvement in one of my own fishless cycles when I switched to Prime from another brand of conditioner which I had used and liked for many years in my previous period in the hobby. Being only one case, this of course can't count for much, but it was my observation at the time.
~~waterdrop~~