Which vitamins can be used transdermal?

All, Limited: Goals?: Back to basics: our skin acts as a barrier to block significant absorption of most compounds. We keep growing & shedding skin cells, thus shedding all attached compounds along with the residual cellular debris. Most vitamin supplements (often more marketing than evidence of real efficacy, except in deficiency) are formulated as oral or injection forms; to increase ability to get past body barriers.

Several of B group: Several of b group of vitamins could be given trasdermally , especially vit B12 , which is not absorbed orally in some cases due to gut problems , patches are available