Lac Resin (Shellac).
A natural resin coating that protects tablets from stomach acid so they dissolve in the intestines instead. Forms a pH-sensitive coating that protects ingredients from stomach acid for targeted intestinal release.
Reviewed March 2026
- Category
- General
- Also filed under
- Protects ingredients from stomach acid degradationEnables targeted intestinal releaseGives tablets a smooth, glossy finish
What Lac Resin (Shellac) is, and what it does.
- Does it work
- Functional coating. Can actually improve efficacy of acid-sensitive ingredients.
- How much to take
- There is no daily amount to take. It is a film on the outside of a tablet, applied at whatever coating weight the release profile needs, not something dosed separately.
- Time to feel it
- It's a coating rather than an active, so it has no onset of its own. Its job is holding the tablet intact through the stomach and opening as pH rises further along.
- The first dose
- Coating works as designed. You don't feel it.
- With regular use
- The resin itself passes through unchanged. What weeks of use give you is consistent delivery, holding acid-sensitive ingredients intact until the tablet is past the stomach.
- How well tolerated
- Widely used as a food glaze and generally well tolerated, with rare allergic reactions reported. It comes from an insect, so it does not suit a vegan product.
- How it feels
- Smooth, shiny tablet. Slightly slower release of contents.
- The overlooked benefit
- A dried shellac film is a low-permeability barrier to moisture and oxygen, so it doubles as a seal coat over ingredients that draw damp or oxidise, not just a gloss.
The proof, claim by claim.
These words describe the research, not the molecule's worth. Research strength is how much work stands behind one claim, and it is never a product score.
- Enables targeted release
Questions people ask about Lac Resin (Shellac).
- Is shellac from bugs?
- Yes. The lac bug secretes a resin that's harvested and refined. Used for centuries.
- Why coat tablets at all?
- Some ingredients are destroyed by stomach acid. The coating protects them until they reach your intestines.
- Should I crush my coated tablets?
- No. Crushing defeats the purpose of the enteric coating and may reduce effectiveness.
Why these belong in the same formula. Each row says what the basis is, from settled biochemistry through to a trial that measured the pair.
Shellac forms a hard, brittle moisture-barrier film, and beeswax is added as a plasticising polish so the coat does not craze on handling. The combination is the traditional glaze on coated tablets and confectionery-style supplements.
Shellac is applied over an HPMC subcoat because the cellulose layer adheres to the tablet core while the resin supplies the acid-resistant barrier. Layering the two gives a coat that neither polymer produces alone.
Shellac stays insoluble at stomach pH and dissolves at the higher pH of the small intestine, which is one way an enteric coat lets peppermint oil pass the stomach intact. Other enteric polymers are more common for this use, so shellac is one option rather than the standard.
Pancreatic proteases and lipase lose activity at gastric pH, so they are coated to hold the dose closed until it reaches the small intestine. Shellac is acid-insoluble and dissolves as pH rises, which is the property that does that job. Coating thickness and the exact grade determine where the dose actually opens.
Nattokinase is a bacterial serine protease and, like other enzyme actives, is degraded by stomach acid and pepsin. An acid-resistant shellac film keeps the dose intact through the stomach. The coating is a delivery decision and does not change the enzyme itself.
Bromelain taken for effects beyond digestion is usually coated so that it is not consumed by gastric conditions before absorption. Shellac supplies an acid-resistant film for that purpose. The distinction matters: an uncoated bromelain product and a coated one are aimed at different places in the gut.
Most probiotic species lose viability at gastric pH, so delayed-release coatings are used to carry more of the dose past the stomach. Shellac films are one option for that barrier alongside polymer capsules. What survives depends on strain, coating integrity and how the product was stored.
Alliinase converts alliin to allicin, and the enzyme is inactivated by stomach acid, so garlic tablets intended to generate allicin are enteric coated. Shellac gives that acid resistance. Aged garlic preparations work through different sulfur compounds and do not depend on the same step.
Coating a fish oil capsule so it opens below the stomach is the usual approach to reducing the fishy repeat that puts people off the ingredient. Shellac provides an acid-resistant film for that. The coating changes where the oil is released and not how much omega-3 is in the capsule.
Shellac stays intact while pH is low and dissolves once it rises. Taking an acidifying agent alongside an enteric-coated product keeps gastric pH lower for longer, which can push the release point further along. The interaction is on the timing of release, not on either active.
Bicarbonate raises stomach pH, and a shellac film dissolves above roughly neutral pH. Taking an antacid alongside an enteric-coated product can open the coating earlier than intended, in the stomach itself. Manufacturers assume a normal gastric pH when they set coating thickness.
Carbonate antacids consume gastric acid and raise stomach pH, which is the trigger condition for a shellac film to begin dissolving. Taken together, an enteric coat may open earlier than the formulator intended. Calcium carbonate also appears as an inert filler under a shellac coat, a different situation entirely.
Shellac gives the hard, sealing layer and carnauba wax is polished over it for gloss and slip. The combination is standard on coated tablets and on confectionery. Both are coatings and neither is an active.
Lactase needs to be present in the small intestine at the same time as the lactose it acts on, which argues for fast release rather than a delayed one. An acid-resistant coating can push release past the window in which the meal is still there. Coating choice here is a trade-off in timing rather than an improvement.
This yeast tolerates acid better than most bacterial probiotic species, so an acid-resistant coating is less often used. Where a formulator does coat it, shellac supplies the barrier. The benefit of coating is smaller here than for acid-sensitive lactobacilli.
Talk to a doctor before taking Lac Resin (Shellac) if any of these apply to you: Derived from insect secretions (not vegan), Rare allergic reactions possible. These are flags to check first, not effects Lac Resin (Shellac) is known to cause.
Not medical advice. Show the label to your pharmacist.What Lac Resin (Shellac) actually does.
Shellac is a natural resin secreted by an insect, built from certain fatty and plant-derived acids.
The acidic groups in this resin stay closed off and insoluble in stomach acid and only open up once the surroundings become closer to neutral, which is what makes shellac act as an acid-resistant coating that opens further along the gut.
Shellac dissolves in alcohol and mild alkaline solutions but not in water or acid, which is why coating solutions are alcohol- or ammonia-based and why the dried film holds up against stomach conditions.
A dried shellac coating blocks moisture and oxygen well, which is why it's used to seal tablets that are sensitive to humidity or oxidation, as well as for shine.
Where Lac Resin (Shellac) comes from.
Tiny lac insects coat tree branches in a hard resin, and that crust is scraped off, crushed and washed. The washed granules are melted and filtered, or dissolved in alcohol and filtered, to get a clean resin. Some grades then have the natural wax removed or are bleached pale. It arrives at the factory as flakes or as a ready-made solution for coating tablets. Because it comes from an insect, it is not a vegan ingredient.
Made from an animal material. Species and tissue are the things worth knowing, and both belong on a label.
Lac insects colonise host trees such as kusum, palas and ber, mainly in India and Thailand, and secrete a hard resin over the twigs. The encrusted twigs are cut and the crude resin, called sticklac, is scraped off. It is an insect secretion, which is why the material is not vegan.
Sticklac is crushed, sieved and washed to remove twig fragments, insect bodies and the water-soluble lac dye. The washed granules are dried, giving seedlac.
Seedlac is either melted and forced through cloth, the traditional hand-made process that yields sheets and buttons, or dissolved in ethanol and filtered. Heat processing polymerises the resin somewhat. Solvent processing does not, which is one reason the two grades behave differently.
Natural wax at around 5 percent is filtered out of the alcoholic solution to make dewaxed grades. Bleaching with hypochlorite produces the pale grade used on light coatings, at the cost of storage stability.
Batches are classified by colour index, wax content, acid value and life under heat. Those numbers, not the trade name, predict how the film will dissolve.
Sold as dry flakes for the coater to dissolve, as a ready alcoholic cut, or as an ammoniated aqueous dispersion for solvent-free coating lines.
Getting Lac Resin (Shellac) from food.
The whole-food sources on file. A supplement closes the gap, it does not replace dinner.
A gram-for-gram figure (how much of each you would eat to match a dose) will appear here once it is sourced and reviewed. This page will not print a number it cannot cite.
The forms it comes in.
The essence, in one line each.
- In rats fed a high-fat diet, seedlac and shellac administration was associated with lower body weight gain and altered lipid measures compared with the untreated high-fat group.Animal study. Poorassar et al., 2020 (Research in Pharmaceutical Sciences). PMID 32180817 ↗
These are the studies our verdict leans on, chosen from the 1 we read for Lac Resin (Shellac). The full linked list is below.
FDA Disclaimer: These statements have not been evaluated by the Food and Drug Administration. This information is for educational purposes only and is not intended to diagnose, treat, cure, or prevent any disease. Consult your healthcare provider before starting any supplement regimen.
