Kratom "strains" are not different plants: every commercial strain is leaf from the same species, Mitragyna speciosa, and labels like red, green and white describe the color of the leaf's vein. A 2023 study that compared lab reports across red, green and white products found no significant differences in alkaloid content between them, so the lab report tells you more than the color.
This guide explains what the labels mean as of 2026. It describes how kratom is marketed and what research has measured; it does not make claims about effects or health uses.
The plant behind every strain
Kratom is "a tree in the coffee family, found in Thailand and neighboring countries," according to the NIH's National Center for Complementary and Integrative Health. The leaves contain alkaloids; the two most studied are mitragynine and 7-hydroxymitragynine (7-OH), which NIDA notes are the main compounds researchers focus on. Leaf products contain 7-OH only in small, naturally occurring amounts; concentrated 7-OH products are a different category, covered in what is 7-OH and why we don't list it.
Every strain you see on a vendor's site, whether "Red Bali," "White Maeng Da" or "Green Malay," is this same species.
What vein colors mean
Vendors sort kratom into colors based on the central vein of the leaf. The descriptions below are how vendors present the categories; for example, MIT45's strain guide describes the three main colors this way. Buyers can't verify harvest stage from the bag.
Red vein
MIT45 describes red as coming "from the most mature Mitragyna speciosa leaves whose veins have turned reddish." Red is one of the most common categories on vendor sites; Kraken Kratom and Left Coast Kratom each list several red powders.
Green vein
Green is described as leaf harvested at a middle point in the plant's maturation, between white and red.
White vein
White is described as "derived from the tree's young leaves," an earlier harvest than red.
Yellow, gold and blends
"Gold" is not a vein color on the tree. MIT45's guide says products described as gold kratom "are almost always a mix of different colored vein kratoms." "Yellow" is used in a similar vendor-defined way; Happy Hippo, for example, sells "Sunshine Hippo" as a yellow vein Maeng Da. Some vendors also sell "pink" or "horn" products, whose meaning varies by vendor.
What the research says about colors
The most direct test of whether color labels match chemistry is a 2023 study by Huisman and colleagues in the International Journal of Environmental Research and Public Health (PubMed, DOI). The researchers surveyed 644 kratom users, mostly customers of one vendor, Super Speciosa, and compared their answers with that vendor's certificates of analysis for red, green and white products.
Two findings stand out:
- Respondents described the colors differently. Their descriptions lined up with how the colors are typically marketed, with white rated as the most stimulating and red the least.
- The lab reports did not show matching chemistry. The authors report that "the product analyses revealed no significant cross-strain differences in alkaloid content."
The authors suggested that perceived differences "might be disproportionally influenced by marketing narratives and anecdotal reports." The study covered one vendor's products and relied on self-reported surveys, so it isn't the final word. But it's a good reason to compare strains using lab reports rather than color names.
Where strain names come from
Most product names combine a vein color with a place name or a trade name:
| Name part | What it usually means |
|---|---|
| Bali, Borneo, Sumatra, Indo | A claimed Indonesian origin or regional style |
| Malay (Malaysian) | A claimed Malaysian origin or style |
| Thai | A claimed Thai origin or style |
| Maeng Da | A vendor trade name sold in every color; Golden Monk, for example, sells green, white and red Maeng Da |
| Horn | A vendor label (for example Happy Hippo's Red Horn); meaning varies |
| House names | Vendor brands, such as Kats Botanicals' "White Elephant" or Happy Hippo's "Magic Hippo" |
Origin names are rarely verifiable by the buyer. A "Bali" from one vendor is not guaranteed to match a "Bali" from another. Happy Hippo and Kats Botanicals at least pair their house names with the underlying color and region on product pages.
How to compare strains the useful way
- Open the COA for the exact batch. Look for mitragynine and 7-OH values, plus heavy metals and microbial tests. See how to read a kratom lab report.
- Compare percentages, not names. Two "Green Maeng Da" bags from different vendors are not guaranteed to match, so compare their COAs.
- Prefer vendors with batch lookup. Super Speciosa and Kats Botanicals let you look up a batch by lot number; Golden Monk posts a COA per product and size.
- Buy small first. Vendors such as Happy Hippo sell 1 oz bags. See all options in our kratom vendor list.
Common misunderstandings
- "Red and white are different plants." They are the same species, Mitragyna speciosa.
- "Maeng Da is always the strongest strain." Maeng Da is a vendor name sold in every color. Any strength claim should be backed by an alkaloid percentage on a COA.
- "Enhanced" is a strain. "Enhanced" products are sold by vendors as a separate category from plain leaf; Kats Botanicals, for example, lists its "Rogue Rhino Enhanced" apart from its standard strains. KratomRated covers plain leaf only.
Legal and safety note
The FDA has not approved kratom for any medical use and warns consumers not to use it, citing risks including liver toxicity, seizures and substance use disorder. The NCCIH notes that research on kratom is at an early stage. Kratom is banned in several states and some cities; see kratom legal status by state (2026). Vendors should sell only to adults 21+.
For vendor rankings, see best kratom vendors.