There is none. You're left with having to infer based upon the composition of the products and the number of approvals attained. Even if you end up with being able to determine that Brand X should be "better" than Brand Y, you won't be able to determine by how much.On that note, what's the protocol to distinguish between products that achieve the standards at minimum levels with those that exceed approvals & standards?
On an aside, Blackstone has through their database found no statistically significant differences between oils of similar weight.