How Transdermal Patches Actually Work
Transdermal delivery is real, established technology for certain compounds — but it's not a universal upgrade over swallowing something, and the honest limits matter.
Here's the straightforward science: what transdermal delivery is good at, and where the evidence for supplement patches specifically gets thinner.
The proven cases
Transdermal delivery is well-established for certain small, fat-soluble molecules — nicotine patches and some hormone therapies are genuine, well-studied examples. Skin can be an effective delivery route for the right kind of compound.
Where it gets less certain
Many supplement ingredients, including several used in wellness patches, are larger molecules or water-soluble compounds that don't cross skin as readily as the proven transdermal drug examples. The honest state of the science is that transdermal delivery works well for some compounds and poorly for others — and manufacturers don't always specify which category their ingredients fall into.
What a patch format genuinely offers, regardless of absorption efficiency
Even if transdermal absorption is less efficient than an equivalent oral dose for some ingredients, a patch offers a real behavioral advantage: no capsule to remember, no taste, no stomach upset. For some people, that adherence benefit is worth something on its own, separate from any absorption-efficiency argument.
Where this leaves GLpatches
GLpatches' seven ingredients include some with more established transdermal precedent and others where oral studies dominate the research. We think that's worth knowing rather than assuming every ingredient absorbs equally well through skin.
