The science just isn't there. This is marketing of an unproven drug delivery system, and everyone should know that no vitamin patches have been rigorously evaluated or approved by the FDA. Getting a predictable and high enough dose of anything though the skin is extremely challenging, even for the pharma company that spent hundreds of millions of dollars perfecting the nicotine patch, which is for short term use only. Unlikely that these vitamin companies have spent an equivalent amount researching the success of vitamin delivery through different skin types, at various ages, in different climates, and with different vitamins and minerals. When it is for long term use, you have to also add in changing dosing needs over a lifetime.
I know there is a lot of money to be made in this. It concerns me that even oral vitamins are not monitored by the FDA for purity, safety and concentration, and this adds the unpredictability of dosing via the transdermal delivery.
I wouldn't venture to promote or sell this unproven technology, at any price, for a DS patient. We aren't just casual vitamin users whose health doesn't really depend on the successful delivery of the right dose.