I'm not sure what you were reading, but on the product you linked, only a very small portion of it is made of vitamins.
The main ingredients are:
1. Evening Primrose Oil, which, like S-Equol (A main ingredient in Brotzu) is derived from a plant. And is often used with soy isoflavones (which is what S-Equol is) for naturopathic (aka bullshit) remedies.
2. Methionine, also known L-Methionine, is an amino acid studied to be involved in keratin production
(L-Carnitine, a main ingredient in Brotzu, is an amino acid)
3. Cystine, which is another amino acid found in high concentrations in hair cells.
4. Glycine soja oil, which is a soybean oil, (isoflavone just like s-equol). And guess what, it consists of linolenic acid. You know borage oil, a common hair loss supplement? Borage oil has gamma-linolenic acid. Guess what DGLA (the main ingredient in Brotzu) is? It's dihomo-gamma-linolenic acid.
So it seems like this product has virtually identical ingredients as Brotzu. It literally checks every single box that Brotzu's lotion checks. The only difference is Brotzu has the magical liposomes. I don't know how much hope juice you can squeeze out of this information, but it's not much.
All of this information you can easily find on google. Please feel free to research it and discuss it if you'd like.
There are two ways to interpret this information:
Optimistic:
1. Brotzu is exactly like many other multi-decade-old hair health products. Research on these ingredients implies they truly help hair, but if the products aren't actually helping hair, why do products with virtually identical ingredients keep coming out? Maybe they do help, but only if they get to the follicle properly. Maybe Brotzu's liposomes make it possible.
Pessimistic:
2. Brotzu's lotion is exactly like many other multi-decade-old hair health products that don't work. And this won't work either.
You can choose which one you believe in.