I looked into the product. It has 5 basic ingredients: Vitamin C, Zinc, Larch Tree Extract, Elderberry Powder and Wellmune.
According to my 5 minutes of google research, the first 4 ingredients genuinely help your immune system. The 5th ingredient, Wellmune, also claims to help your immune system though I couldn't find any sort of independent confirmation of that (such as WebMD or drugs.com).
So it's not snake oil. It is a vitamin and mineral supplement, and vitamin and mineral supplements have legit health value. However, like everything else on TB12, you can literally find the same item elsewhere for less than half the cost.
I'll stick to orange juice and 1-a-days, and save myself $500 annunally.