Why it matters
Yellow vein is not, strictly speaking, a “vein colour” — the underside of the live leaf is not yellow. It refers to a finished-powder colour produced by extended drying, fermentation, or UV exposure applied to leaf that was originally white or green. The processing shifts the alkaloid profile toward more sedating compounds while preserving some of the source colour’s character.
In practice
In effect profile, yellow vein products are often described as sitting between green and red — longer-lasting and more relaxing than the source green or white, but less sedating than a typical red. Dose-finding mirrors the green/red advice: start low, allow time to assess, then titrate.
Common confusion
Yellow vein is sometimes presented as a fourth equivalent of red/green/white. It is more accurately a processing variant — useful as a descriptor of expected effect, less useful as a botanical category.
This glossary entry is editorial content reviewed against primary sources. It is not medical advice. See our Editorial Policy.