Label and dose
Bioavailability is the whole argument, and almost nobody prints it
A compound with excellent trial data can be sold in a product that delivers almost none of it. Absorption is where most supplement disappointment originates.
Every argument about whether a supplement works eventually collapses into a question about whether it was ever absorbed. This is the least discussed and most decisive variable in the category.
The short version
- Many popular polyphenols and flavonoids have oral bioavailability in the single digits as percentages.
- Enhanced absorption formats can be legitimate, but the claim needs supporting pharmacokinetic data specific to that product.
- Trial doses and label doses are only comparable if the format is comparable.
- Food matters. Fat-soluble compounds taken on an empty stomach can lose most of their delivery.
Where the losses happen
A swallowed compound has to survive stomach acid, dissolve, cross the intestinal wall, and then pass through the liver, where a large fraction of many compounds is metabolised before ever reaching general circulation. That last step, first-pass metabolism, is where most polyphenols lose the bulk of their dose.
Solubility is the other common failure. Compounds that do not dissolve well in water simply do not present enough material for absorption, regardless of how much is in the capsule.
What the enhancement formats actually do
Liposomal preparations wrap the compound in a lipid layer to improve uptake. Phytosome and phospholipid complexes bind it to a carrier molecule. Micronisation reduces particle size to increase dissolution surface. Piperine and similar adjuncts inhibit some of the enzymes that would otherwise clear the compound.
All of these are real techniques with real published effects on specific compounds. None of them works automatically. A product describing itself as liposomal without supporting pharmacokinetic data is claiming a category, not a result. Ask for the data. Reputable ingredient suppliers have it.
The dose on the label is the dose you swallow. The dose that matters is the one that reaches circulation, and those two numbers are frequently very different.
Novermix
How this breaks dose comparisons
If a trial used 500 milligrams of a standard preparation and a product contains 125 milligrams of an enhanced one, the correct comparison is not 125 against 500. It depends entirely on the enhancement factor, which the label rarely gives you.
This cuts both ways. Enhanced formats can genuinely justify smaller doses. They can also be used to make an underdosed product look sophisticated. Without the pharmacokinetic data you cannot tell which one you are holding.
Practical things that change absorption
Take fat-soluble compounds with a meal containing fat. Split large doses of poorly absorbed compounds through the day rather than taking them at once. Check whether a compound competes with anything else you take at the same time, since minerals in particular interfere with each other.
None of this is exotic and all of it is more consequential than the choice between two similar brands.
Common questions
Does more expensive mean better absorbed?
Not reliably. Price tracks marketing and ingredient licensing at least as closely as it tracks delivery.
How do I find the pharmacokinetic data?
Branded ingredients usually publish it or supply it on request. Generic ingredients rarely have product-specific data, in which case the enhancement claim is a general one rather than a measured one.
Sources
- Best fisetin supplement 2026: senolytic evidence — https://thrivetrilogy.com/best-fisetin-supplement-2026/
- Natural bioactive compounds targeting key hallmarks of aging — https://www.mdpi.com/2072-6643/18/15/2511