Kratom strains and vein colours: what the names on the bag actually mean

Every Canadian vendor sells kratom under two labels: a colour (red, green, white, sometimes yellow or gold) and a strain name (Maeng Da, Bali, Borneo, Malay, Thai, Hulu Kapuas, Sumatra, Bentuangie, Elephant, Horn and more). Buyers reasonably assume these are like grape varieties or coffee origins. Mostly they are not. This guide explains what each label actually describes, what the published analyses of commercial powders have found, and what the labels are still useful for. It describes the market; it does not recommend any strain or tell you what to expect from one.

Last reviewed: November 9, 2026. Part of the KratomSource knowledge base.

One species, one region

All commercial kratom is Mitragyna speciosa. There are no recognized cultivars in the horticultural sense, no registered varieties, and no system that ties a name on a bag to a particular tree, farm or genetic line. The great majority of exported powder, including what Canadian vendors sell as “Thai”, “Malay” or “Bali”, is grown in West Kalimantan, Indonesia; Thailand only legalized exports in 2021 and Malaysia prohibits them. The names are product designations applied by processors and exporters, and the same leaf can be sold under several of them.

What the colours describe

Fresh kratom leaves do have veins that range from reddish to greenish, and processors sometimes sort by vein. But in practice the colour of the finished powder is produced mainly by drying: longer drying, sun exposure and bagging the leaf while damp so it ferments and darkens push a powder toward “red”; shorter, shaded drying keeps it “green”; indoor-dried or younger leaf is often sold as “white”. “Yellow” and “gold” generally mean an extended or two-stage drying of green or white leaf, and “Bentuangie” names a deliberately fermented red. Our processing guide covers the steps.

Because drying can change the alkaloid mix (oxidation during fermentation, for example, can convert some mitragynine to other compounds, including small amounts of 7-hydroxymitragynine), the colour is not meaningless chemically. It is a loose indicator of process, not of origin or of a fixed composition.

What the strain names describe

Name	Origin of the name	What it means in practice
Maeng Da	Thai slang, roughly “pimp grade”; marketing term for a premium selection	A processor’s higher grade, often leaf from older trees or a tighter sieve. No single source.
Bali	The Indonesian island, historically a shipping and trading point	Almost never grown on Bali. A generic designation, usually red.
Borneo / Kalimantan	The island where most kratom is actually grown	The most geographically honest label, and still generic.
Hulu Kapuas	Kapuas Hulu regency, West Kalimantan	Names the actual main growing region. Still a processor designation.
Malay / Malaysian	Malaysia	Exports from Malaysia are prohibited; the leaf is Indonesian. A style label.
Thai	Thailand	Thai exports were illegal until 2021; most “Thai” is Indonesian. Some Thai leaf is now entering the market.
Sumatra, Indo, Vietnam	Islands and countries	Style labels; Vietnamese and Sumatran leaf exists but is a small fraction of trade.
Elephant	Large leaf size	Describes leaf selection, not origin.
Horn / Horned	Serrated or spiked leaf edge	A leaf-shape selection some processors make. Not a variety.
Bentuangie	A processing method	Fermented red leaf; the one name that reliably describes a process.
Super, Premium, Ultra	Grade words	Vendor’s own grading, usually leaf-to-stem ratio or sieve fineness.

What laboratory analyses have found

Several groups have bought commercial kratom products and measured their alkaloids. The consistent finding is wide variation between products and between batches of the same product, with mitragynine in leaf powders typically in the 1–2% range by weight and no stable relationship between the name or colour on the label and the alkaloid profile inside. Products labelled with the same strain from different vendors can differ more than products with different strain labels from the same vendor. A 2016 analysis of US products also found 7-hydroxymitragynine at levels above what leaf naturally contains in several of them, which the authors interpreted as likely adulteration.

The practical reading: a strain name tells you how a vendor has categorized and priced a powder, and the colour tells you roughly how it was dried. Neither tells you what is in the bag, and neither tells you anything about safety. Only a lot-specific certificate of analysis does that, which is why our vendor rankings score lab transparency and our own testing buys the finished retail bag.

Why the names persist

They are useful to vendors and to repeat buyers. A vendor that sources consistently from the same processor can keep “its” Green Maeng Da reasonably similar batch to batch, and buyers who have settled on a product want to reorder the same one. The names work as a vendor-internal catalogue. They stop working the moment you compare across vendors, which is the comparison most buyers are trying to make. Our vendor pages therefore list which names each store carries without treating them as comparable, and our Lab Scores, when published, will be per product so the same name at two vendors can be seen side by side.

Questions we are asked

Is red stronger than white? Not in any measurable, consistent way across the market. Published analyses do not show colour predicting mitragynine content. Vendors’ descriptions of colour effects reflect convention and customer reports, not testing, and we do not repeat them.

Is “Maeng Da” a real strain? It is a real grade label with a Thai slang origin, applied by processors to what they consider premium leaf. It is not a botanical variety.

Does Bali kratom come from Bali? Essentially never. It is grown in Borneo and named for a trading hub.

Sources

• Kruegel AC, Grundmann O. The medicinal chemistry and neuropharmacology of kratom. Neuropharmacology 2018;134:108–120. PubMed 28830758.
• Lydecker AG, Sharma A, McCurdy CR, Avery BA, Babu KM, Boyer EW. Suspected adulteration of commercial kratom products with 7-hydroxymitragynine. J Med Toxicol 2016;12:341–349.
• Prozialeck WC et al. Kratom policy: the challenge of balancing therapeutic potential with public safety. Int J Drug Policy 2019;70:70–77 (variability of commercial products).
• Thailand Narcotics Act amendment, in force 24 August 2021; Kratom Plant Act B.E. 2565 (2022). Malaysia Poisons Act 1952.
• Antara News, Indonesia officially regulates kratom trade, September 2024.

Frequently asked questions

Are kratom strains real botanical varieties?

No. All commercial kratom is one species, Mitragyna speciosa, with no recognized cultivars. Strain names are product designations applied by processors and vendors.

Is Maeng Da a strain?

Maeng Da is Thai slang roughly meaning 'pimp grade'. It is a processor's premium-grade label, not an origin or a variety.

Does Bali kratom come from Bali?

Essentially never. It is grown in Borneo and named for a historical trading hub.

Does vein colour predict potency?

Published analyses of commercial powders do not show colour reliably predicting mitragynine content. Colour mainly reflects how the leaf was dried.