
Kratom capsules
by Jetpackkratom
Jetpackkratom BRONZE 40mg Extract Capsules are a pre-dosed kratom extract that delivers exactly 40mg of isolated mitragynine per capsule — the equivalent of roughly 4g of dried kratom leaf, compressed into a single swallow. No powder, no brewing, no bitter taste coating the inside of your mouth for the next hour. Just pop, swallow, done.
Each capsule contains pure mitragynine with no other alkaloids present, so the experience is clean and predictable. You know exactly what you're getting every single time — 40mg, no guesswork, no kitchen scales, no clumpy powder refusing to dissolve in your glass.
Kratom powder is a chore. Anyone who's tried the toss-and-wash method — scooping loose powder into your mouth and chasing it with water — knows the gritty, bitter reality. Half of it sticks to your teeth, the other half clumps at the bottom of the glass. Brewing tea is better but takes 15-20 minutes and still tastes like you're drinking a hedge.
Jetpackkratom solved this by isolating the mitragynine and putting it in a capsule. That's the compound doing the heavy lifting anyway. According to a systematic review published in the Journal of Integrative Medicine (2022), mitragynine is the primary active alkaloid in Mitragyna speciosa, responsible for the dose-dependent effects that kratom users seek — mild stimulation at lower doses, relaxation and sedation at higher ones (PMC9285932).
The capsule format also means you can take these anywhere. Tuck a couple in your pocket, your bag, your desk drawer. No one's going to ask why you're stirring green sludge into a glass at the office.
We've sold kratom in every format — leaf, powder, extract, liquid, capsules — and the single biggest complaint with powder is inconsistent dosing. People eyeball a teaspoon, assume it's roughly 2g, and end up anywhere between 1.5g and 3.5g depending on how packed the scoop is. With these capsules, that problem disappears. 40mg of mitragynine, every time. That precision matters, especially when you're still figuring out your sweet spot.
Mitragynine is the most abundant alkaloid in the kratom plant (Mitragyna speciosa), typically making up 60-66% of the total alkaloid content in dried leaf. According to research published in Molecules (2022), mitragynine's pharmacological profile is varied — it interacts with opioid receptors, adrenergic receptors, and serotonergic pathways, which accounts for its dose-dependent range of effects (PMC8907881).
At lower doses (roughly 1-5g of leaf equivalent, or in this case a single 40mg capsule), research suggests stimulating and mood-elevating properties. At higher doses, the profile shifts toward sedation and analgesia. According to a review in Frontiers in Psychiatry (2020), mitragynine appears to modulate pain signalling through multiple mechanisms beyond simple opioid receptor binding, suggesting a more complex pharmacological action than initially assumed (PMC7203303).
What makes these BRONZE capsules distinct is the isolation. There are no other kratom alkaloids in the mix — just mitragynine. That gives you a cleaner, more predictable response compared to full-spectrum kratom products where 40+ alkaloids interact in ways that can vary batch to batch.
| Specification | Detail |
|---|---|
| Brand | Jetpackkratom |
| Product Line | BRONZE |
| Format | Extract Capsules |
| Active Compound | Mitragynine (isolated) |
| Mitragynine Per Capsule | 40mg |
| Leaf Equivalent Per Capsule | Approximately 4g dried kratom leaf |
| Other Alkaloids | None |
| Onset Time | Within 60 minutes |
| Recommended Dose | 1 capsule |
| Plant Species | Mitragyna speciosa |
| Origin | Southeast Asia |
One capsule contains 40mg of mitragynine — that's a meaningful dose equivalent to around 4g of dried kratom leaf. The manufacturer recommends taking 1 capsule at a time, and honestly, that's sound advice, especially if you haven't used concentrated kratom extracts before.
The BRONZE line sits at the entry level of Jetpackkratom's extract range, but "entry level" here is relative. At 40mg of pure mitragynine per capsule, this is already a concentrated product. If you've been drinking kratom tea or mixing powder into smoothies and you're comfortable with doses around 3-5g of leaf, the BRONZE capsule is a natural next step — same ballpark of effects, far less hassle.
If you've never tried kratom at all, these capsules are not the place to start. We'd point you toward a milder format first — loose kratom powder or a lower-concentration product where you can titrate your dose more gradually. Going straight to 40mg of isolated mitragynine without knowing how your body responds to the plant is like skipping the shallow end entirely.
Because these capsules contain only isolated mitragynine, you lose the entourage of other alkaloids found in whole-leaf kratom — compounds like 7-hydroxymitragynine, paynantheine, and speciogynine that contribute to the full character of the plant. Some experienced kratom users find isolated mitragynine feels "flatter" or more one-dimensional compared to full-spectrum products. Others prefer the cleaner, more predictable profile. It's a trade-off: precision versus complexity. Neither is wrong — it depends on what you're after.
We get asked this constantly, so here's a straightforward comparison based on what we've seen over the years.
| Factor | BRONZE Capsules (40mg mitragynine) | Kratom Powder (loose) | Kratom Tea |
|---|---|---|---|
| Dosing Accuracy | Exact — 40mg per capsule | Approximate — depends on scale | Variable — extraction efficiency differs |
| Onset Time | 45-60 minutes | 20-40 minutes | 15-30 minutes |
| Taste | None — capsule bypasses tongue | Bitter, earthy, gritty | Bitter but manageable with honey |
| Portability | Excellent — pocket-sized | Messy — needs container and water | Poor — needs kettle, strainer, cup |
| Alkaloid Profile | Mitragynine only (isolated) | Full spectrum (40+ alkaloids) | Full spectrum (partial extraction) |
| Best For | Precision dosing on the go | Flexible dosing at home | Ritual, gradual onset, full flavour |
Tea hits fastest because the mitragynine is already dissolved in liquid. Powder is next — it starts breaking down as soon as it hits your stomach acid. Capsules are slowest because the gelatin shell needs to dissolve first. The trade-off is convenience and accuracy. Pick the format that fits your day.
New to kratom and want to build up experience before trying concentrated extracts? Start with loose kratom powder — it lets you adjust your dose in small increments while getting familiar with how your body responds. Already comfortable with the BRONZE and looking for something stronger? Jetpackkratom's higher-tier extracts step up the mitragynine content for experienced users.
Kratom interacts with liver enzymes — specifically CYP2D6 and CYP2C19, according to WebMD's pharmacological database. If you're taking any medication processed by these enzyme pathways (which includes a surprising number of common drugs — certain antidepressants, beta-blockers, and antihistamines among them), the interaction could alter how either substance is metabolised. Talk to your GP or pharmacist if you're on regular medication.
According to a safety review published in the Journal of Clinical Pharmacology (2022), the most commonly reported side effects of kratom use include nausea, constipation, dry mouth, and — with regular use — dependence (PMC9130800). The dependence risk is real and worth taking seriously. Don't use these capsules daily for extended periods. Build in breaks. A pattern of 2-3 days on, 4-5 days off, keeps tolerance from creeping up and reduces the risk of withdrawal symptoms.
An exploratory safety study published in Psychopharmacology (2024) noted that while acute kratom use at moderate doses showed a manageable safety profile in controlled settings, chronic high-dose use raised concerns around liver function markers and sleep disruption (PMC12084173).
Do not combine kratom with alcohol, benzodiazepines, opioids, or other CNS depressants. The combination can amplify sedation to dangerous levels.
Each capsule contains 40mg of isolated mitragynine, which is roughly equivalent to 4g of dried kratom leaf. That's a moderate-to-strong dose for most people. If your usual powder dose is 2-3g, one capsule will feel noticeably stronger.
Technically yes, but there's little point. The capsule exists specifically to bypass the bitter taste and provide accurate dosing. Opening it gives you a tiny amount of concentrated extract that's difficult to measure if you split it. Just swallow the capsule whole.
Most people report effects lasting 3-5 hours, with the peak occurring around 1.5-2.5 hours after ingestion. Duration depends on your metabolism, body weight, and whether you've eaten recently.
You can, and absorption will be faster. However, concentrated kratom extracts on a completely empty stomach cause nausea in some people. A light snack — a banana, a few crackers — about 30 minutes before dosing usually prevents this without significantly slowing onset.
Daily use is not recommended. Regular kratom use — particularly concentrated extracts — can lead to tolerance and physical dependence. According to a 2022 review in the Journal of Clinical Pharmacology, dependence and withdrawal symptoms are among the most commonly reported adverse effects of chronic kratom use. Build in rest days between doses.
No. Combining kratom with alcohol or other CNS depressants increases the risk of excessive sedation, respiratory depression, and other serious adverse effects. Keep them separate.
Mitragynine primarily binds to mu-opioid receptors, but also interacts with adrenergic and serotonergic systems. According to research in Frontiers in Psychiatry (2020), this multi-receptor activity accounts for its dose-dependent profile — stimulation at lower doses, sedation at higher ones. It's more pharmacologically complex than a simple opioid agonist.
Last updated: April 2026
Medical disclaimer. This content is for informational purposes only and does not constitute medical advice. Consult a qualified healthcare provider before use of any substance.