Wood Creosote.
A purified beechwood distillate used in Japan for an unsettled stomach. It acts on how the gut lining moves water and salts rather than on how fast things travel.
- Category
- Compound
What Wood Creosote is, and what it does.
- Does it work
- It suits people who want a traditional option to carry for digestive upset, particularly when travelling. The literature is small, at 157 published records.
- How much to take
- No dose figure is on record for wood creosote, so we won't invent one. It's used as a short course rather than as a daily maintenance habit.
- Time to feel it
- Where it has been described, the effect is a matter of hours rather than days. It doesn't need weeks of build-up.
- The first dose
- Day one is where the action is. Expect a smoky, medicinal taste, and for the gut to settle over a few hours rather than instantly.
- With regular use
- Weeks of daily use isn't what it's for, and nobody has measured what continuous long-term intake does. It's a short-course ingredient.
- How well tolerated
- Short use is generally well tolerated. Phenolic compounds can irritate the stomach lining, and it isn't one for children or in pregnancy without a clinician's input.
- How it feels
- Strongly smoky and medicinal on the tongue. Past the taste, what you notice is a calmer gut, not any change in mood or energy.
- The overlooked benefit
- Pharmaceutical beechwood creosote and the coal-tar wood preservative share a name and little else. The purified grade has the polycyclic aromatic content removed.
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.
- Intestinal water and electrolyte movement at the mucosal surfaceNarrative review
- Comfort during episodes of loose, urgent stoolsRandomised trial
- Antimicrobial activity of its guaiacol and cresol fractionIn vitro study
- Phase II conjugation and urinary excretion of its phenolsNarrative review
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.
Activated charcoal binds phenolic compounds avidly, and wood creosote is a mixture of guaiacol, creosol and related phenols. Taken at the same time, the charcoal will adsorb a share of the creosote in the gut lumen before it can act or be absorbed. Separating them in time is the standard way to avoid this, and the interaction is a general property of charcoal rather than anything specific to creosote.
Psyllium binds water and forms a gel that changes stool form physically. Wood creosote is described in the Japanese pharmacological literature as acting on intestinal fluid movement rather than on bulk. The two routes are independent, so a formulator may combine them, though no trial has tested the pair.
S. boulardii is a yeast that acts within the gut microbial community over days. Wood creosote is a small-molecule mixture with a short window of action. A phenolic antimicrobial fraction could in principle press on the same yeast that is being supplied, so timing matters and the combination has not been studied.
Water follows sodium and glucose across the intestinal epithelium, which is the basis of oral rehydration. Anything that reduces stool water output does not itself replace losses already incurred. Pairing is about covering both sides of the fluid ledger, not about one boosting the other.
Peppermint oil relaxes intestinal smooth muscle through calcium channel effects, which addresses cramping rather than fluid. Wood creosote is described as acting on secretion and absorption of water. The two targets do not overlap, so co-formulation is plausible on mechanism alone.
Guaiacol and cresols carry antimicrobial activity against a broad range of bacteria, which is part of why beechwood creosote has been studied as an antibacterial. Live bacterial cultures dosed alongside are exposed to that same activity in the lumen. Separating the doses is the sensible formulation answer.
Slippery elm mucilage forms a viscous layer over the gut lining, a purely physical effect. Wood creosote is pharmacologically active on secretion. Nothing links the two beyond both being used for the same complaint, so read this as formulation logic.
Nothing specific on file for Wood Creosote. Match the label to the daily amount above, and tell your doctor what you take.
Not medical advice. Show the label to your pharmacist.What Wood Creosote actually does.
Wood creosote isn't one single compound. It's a distilled fraction of hardwood tar, mainly beechwood, made up of several related phenolic compounds in proportions that depend on how it was distilled.
Pharmaceutical beechwood creosote and coal-tar creosote wood preservative share a name and almost nothing else. The preservative version is dominated by compounds recognized as environmental contaminants, while the pharmaceutical version is a purified phenolic fraction with those removed. Mixing the two up is the single most common mistake with this ingredient.
The simple phenolic compounds here have inherent antimicrobial activity by disrupting bacterial membranes, which is why phenolic distillates were used as disinfectants long before being taken by mouth.
These phenolic compounds are processed by the liver through standard pathways for small phenolic molecules and passed out in urine.
The forms it comes in.
The essence, in one line each.
- Korean beechwood creosote was given to rats without observed toxic effect in the model used, and the authors framed it as a candidate antibacterial agent.Animal study. Quynh AN et al., 2014 (Biotechnology and Biotechnological Equipment). PMID 26019530 ↗
- Bacterial communities from a long-contaminated industrial site were characterised for their ability to degrade polycyclic aromatic hydrocarbons present in creosote.In vitro study. Smulek W et al., 2020 (Ecotoxicology and Environmental Safety). PMID 31678701 ↗
- Metformin produced loose stools in mice under overeating conditions, in a model where antidiarrhoeal agents including creosote preparations are referenced.Animal study. Chikama K et al., 2025 (Diabetology International). PMID 40607156 ↗
These are the studies our verdict leans on, chosen from the 3 we read for Wood Creosote. The full linked list is below.
Problems people have reported.
Read this carefully. These are 2,337 voluntary, unverified reactions reported to the FDA (openFDA). The number mostly reflects how popular Wood Creosote is, not how risky it is. A report is not proof Wood Creosote caused anything. It is a signal of what to watch for, nothing more.
Source: openFDA adverse-event reports. Voluntary reporting, not an incidence rate.
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.