The VH-Rating System works like this:
The higher the number, the more allergens are ABSENT from a product and the better the chances that you won't develop a rash or other skin problems.
The minus sign followed by a number shows the current maximum number of known allergens. The current highest VH Rating is VH - 76/76 (contains 0 of all 76 known allergens).
If a product contains one allergen, its VH-Rating would change to VH -75/76* (contains one allergen out of 76). The asterisk is repeated on the product's ingredient list so you can quickly identify which is the included allergen (it's underlined, too, so you can't miss it). If you've had a patch test, one glance at the ingredient list can tell you if you can still use the product (if, for example, the included allergen is vitamin E but you're allergic to parabens). If you haven't had a patch test, select the higher VH-Rated product.
VMV HYPOALLERGENICS® was the first brand to rate its hypoallergenicity with the VH-Rating System. In 1988, VMV's founding dermatologist-dermatopathologist (a specialist in contact dermatitis and skin diseases) created the VH-Number Rating System as a standardized, objective measure of allergen omission.
The VH-Rating System is proprietary (an original VMV "skinnovation"). It is the only hypoallergenic rating system of its kind and VMV HYPOALLERGENICS® is still the only brand rating its hypoallergenicity.
The VH-Number Rating System helps clients select the right level of hypoallergenicity for their needs.
The VH-Number is a little like an SPF for hypoallergenicity. Much like SPF, the higher a VH number is, the more protected you'll be from allergens. VH tells you that a product has been Validated as Hypoallergenic (VH), and the minus sign and number show you how many allergens are absent from the formulation. The higher the VH-Number, the more allergens are absent from a product, and the more hypoallergenic it is.
The VH-Rating System is based on objective and independent references for allergens: the lists of the most common allergens regularly published by the North American Contact Dermatitis Group (NACDG) and European Surveillance System on Contact Allergies (ESSCA).