BioPerine®.

Curcumin is rapidly conjugated by intestinal and liver UDP-glucuronosyltransferases. Piperine inhibits that conjugation, so far more unconjugated curcumin reaches the circulation.

BioPerine is the conventional partner for standardised curcuminoid extracts because it slows their glucuronidation and sulfation. The pairing is the reason most curcumin labels list a black pepper extract.

Resveratrol is almost entirely converted to glucuronide and sulfate conjugates on first pass. Piperine inhibits those enzymes, and the reported rise in parent resveratrol comes mainly from animal pharmacokinetic work.

Piperine inhibits the glucuronidation and efflux that clear EGCG in the intestinal wall, so more of the catechin crosses intact. The effect is documented mainly in animal pharmacokinetic studies.

Piperine slows the intestinal metabolism of absorbed carotenoids, and small human dosing work reports higher serum beta carotene when the two are taken together.

CoQ10 is large and lipophilic with limited uptake. Piperine inhibits P-glycoprotein efflux at the enterocyte, which raises the plasma level reached from the same dose.

Berberine is pumped back into the gut lumen by P-glycoprotein, which is why so little is absorbed. Piperine inhibits that pump, and the higher exposure from an unchanged dose is shown in animal models.

Quercetin is heavily sulfated and glucuronidated in the gut wall. Piperine inhibits those conjugating enzymes, so a larger share of the flavonol circulates unconjugated.

Piperine and capsaicin both activate the TRPV1 channel on sensory nerve endings, so their warming and gastric effects add together rather than acting at separate sites.

Green tea catechins are conjugated so fast in the gut wall and liver that only a small fraction circulates unchanged. Piperine slows that conjugation step and animal work reports higher plasma catechin exposure when the two are given together. Human confirmation for this specific pair is thinner than the mechanism suggests.

Silybin is one of the more heavily conjugated botanical compounds, and low oral exposure is its known limitation. Piperine acts on the same conjugation route, which is the reason the two appear together in formulas. The effect size for this pair has not been established in people.

Pterostilbene carries two methoxy groups where resveratrol carries hydroxyls, so it is conjugated less readily and starts from higher oral exposure. Adding piperine still targets the residual glucuronidation route, but the headroom is smaller than with resveratrol. Worth stating so a formula does not assume the same benefit transfers.

Lutein has to be incorporated into mixed micelles before it crosses the enterocyte, which is why it is normally taken with fat. Piperine has been described as increasing carotenoid uptake, most of that work being on beta-carotene rather than lutein. Extending it to lutein is a reasonable inference and not a measured result.

Astaxanthin absorption is driven mostly by the lipid vehicle it is dissolved in rather than by conjugation enzymes. Piperine is included in some carotenoid blends on the general carotenoid precedent. The specific pairing has not been quantified.

Caffeine is demethylated almost entirely by CYP1A2, and piperine is an inhibitor of that isoform. Combined in a pre-workout or a thermogenic blend, the same caffeine dose can produce a longer exposure than expected. Anyone sensitive to caffeine should count that when both are in one product.

St John's wort induces CYP3A4 and P-glycoprotein over days of use, while piperine inhibits both acutely. Put in one formula they push clearance of co-ingested compounds in opposite directions, and the net result depends on how long the product has been taken. This is a formulation conflict worth flagging rather than a benefit.

Piperine dissolves poorly in water and readily in medium-chain triglycerides, which is why softgel formats disperse it more consistently than dry blends. The lipid also carries the lipophilic partner compound piperine is usually there to support. This is formulation chemistry, not a separate biological effect.

Boswellic acids are large lipophilic triterpenes with poor and food-dependent absorption, and piperine appears in many joint-comfort blends built around them. The pairing is standard formulation practice with limited dedicated pharmacokinetic work. State it as practice, not as a demonstrated increase.

Withanolide-standardised ashwagandha extracts frequently carry a small piperine addition in commercial products. No pharmacokinetic study establishes that piperine changes withanolide exposure. It is listed because the combination is widespread, not because it is characterised.

Piperine has been described as increasing intestinal uptake of several nutrients including minerals, largely in rodent models. Human data specific to iron and piperine is scarce. Anyone managing iron intake should not count on this as a reliable lever.

Reports of piperine altering uptake of B vitamins come mainly from supplier literature and preclinical models rather than controlled human pharmacokinetics. Vitamin B6 already absorbs well by passive diffusion at supplement doses, so the headroom is limited. Included at low confidence for completeness.