Kratom strains — vein colors and alkaloid profiles.
Direct answer
Vein colors — red, white, and green — do not represent distinct plants. They describe post-harvest drying time, which changes the alkaloid ratio between mitragynine and 7-hydroxymitragynine. Yellow vein is a fermented or blended product, not a natural leaf color.
Medically reviewed by Dr. Irvine Russell · Updated April 2026
Maeng Da
Often the most potent strain commonly sold in the US. 'Maeng Da' translates loosely to 'pimp grade' — a marketing term that stuck. Mitragyni…
Bali
Widely available and typically moderately priced. The name is historical — most "Bali" kratom is actually grown in Borneo. A beginner-friend…
Borneo
Borneo kratom comes from the Borneo island region of Indonesia. Generally considered mellow and long-lasting, with a smoother effect curve t…
Indo
'Indo' is a catch-all term for Indonesian kratom not tied to a specific island. Typical alkaloid profiles fall within commercial averages; t…
Malay
Malaysian kratom, though much harder to source legally from Malaysia itself (Malaysia prohibits kratom domestically). Most US "Malay" is act…
Yellow Vein
"Yellow vein" kratom is produced by post-harvest fermentation or blending of red and green leaves. Not a distinct plant variety. Effects are…
Understanding vein taxonomy
Red vein
Dried longer, often outdoors. Higher conversion to 7-OH metabolite — more sedating, analgesic.
White vein
Fastest-dried, typically indoors without UV. Preserves higher mitragynine — more stimulating, focus-oriented.
Green vein
Middle-ground processing — indoor start, outdoor finish. Balanced alkaloid spectrum; moderate energy and relaxation.
Yellow vein
Post-harvest fermentation or blend of red and green leaves. Not a natural leaf color; effects vary by producer.
Frequently asked
What is kratom?
Kratom (Mitragyna speciosa) is a tropical evergreen in the coffee family native to Southeast Asia. Its leaves contain alkaloids — primarily mitragynine and 7-hydroxymitragynine — that interact with opioid receptors.
Which strain is strongest?
Maeng Da is typically the most potent commercial strain, with mitragynine concentrations often above other strains. Potency also depends on producer, batch, and vein color.
Does vein color matter?
Vein color reflects post-harvest drying and processing, not distinct plant species. Red veins are dried longer (more sedating), whites are fastest-dried (more stimulating), greens fall in between, and yellow is a fermented or blended product.
How should beginners start?
Start with a mild or moderate-potency strain (Bali, Yellow Vein, Green Malay) at the lowest effective amount. Avoid mixing with opioids, alcohol, or benzodiazepines. Buy from AKA-GMP certified vendors only.