"At all"

Except when it is.

https://www.amazon.com/Phosphatidyl-Bulksupplements-Natural-Cognitive-Support/dp/B06XXNWC3D?th=1

$200 for a kilo of 20% PS, which is effectively 200 grams of PS since you have to use a 2:1 or 5:1 ratio to get a proper serving.

60 servings is 6 grams. For $13. That's an encapsulated bulk price of $2,200/kg.