Synthelamin is the B12. Syntheselen is the kyno.
Vet B12 is cyanacobalamin so you have to inj it daily. 1,000mcg ED is a good dose.
Synthelamin is stacked cyanacobalamin and hydroxycobalamin so you only need one or two inj a week. It's also 2,000mcg/ml.
About the price, if you use 2ml/week, a Synthelamin bottle lasts you 1 year straight. That's $1/week.
Regarding the vet B12, since you have to inj ED, you have to buy a number of bottles and as such vet B12 works out to be 50c/week, etc.
Who cares if I spend $1/week and as such I get the benefit of only having to inject only once or twice a week? Am I going to be so petty to say that $1/week is too expensive as some people say, and they would rather inject themselves every single day, just to save 50c/week??
And B12 is water based, so it goes through any needle, and you can do it SQ or IM. I prefer SQ as it's totally hassle free, especially 1 injection SQ per week (Synthelamin).
B12 will give you energy, vascularity and it will make you HUNGRY!