7-OH vs Mitragynine: How the Two Main Kratom Alkaloids Differ

# 7-OH vs Mitragynine: How the Two Main Kratom Alkaloids Differ Kratom leaves contain over forty alkaloids, but two dominate nearly every conversation in the space: mitragynine and 7-hydroxymitragynine (7-OH). They are related — 7-OH is formed by oxidation of mitragynine — but they behave very differently once isolated. If you are trying to figure out which is which and why researchers treat them as distinct compounds, this guide breaks it down. ## Abundance in the Plant Mitragynine is the headline alkaloid. In fresh leaves it typically accounts for 50-70% of total alkaloid content, which is why historical kratom products marketed as "pure kratom powder" were really mostly mitragynine by mass. 7-Hydroxymitragynine is the trace alkaloid. It usually represents less than 2% of the alkaloid profile in fresh leaves and can dip below 0.1% depending on strain, region, and age of the plant. Red-vein cultivars tend to carry more 7-OH because oxidation during drying converts a small fraction of mitragynine into 7-OH. ## Molecular Structure Both are indole alkaloids built on the same corynantheine skeleton. The difference is a hydroxyl group at the 7 position — one extra oxygen atom, essentially. That one change significantly alters receptor affinity. ## Receptor Behaviour This is where the two compounds split. Mitragynine is an atypical mu-opioid partial agonist with relatively low intrinsic efficacy. 7-OH binds the same receptors but with substantially higher affinity — roughly an order of magnitude higher in the literature. Both are partial rather than full agonists, which distinguishes them from synthetic compounds like morphine. In practical research terms: you need much less 7-OH to produce a measurable effect than mitragynine, which is why modern [7-OH tablets](/product/pure-7oh-labs-blue-raz) are dosed in single-digit milligrams while traditional kratom powder is dosed in grams. ## Stability and Shelf Life Mitragynine is relatively stable at room temperature and resists oxidation well. 7-OH is more reactive — exposure to light, heat, and oxygen will slowly degrade it back to inactive forms or other oxidation products. Tablet form in airtight packaging is the gold standard for preserving 7-OH potency. See our guide on [how to store kratom and 7-OH products](/blog/storing-kratom-products) for the full preservation playbook. ## Testing Standards Any reputable vendor tests both compounds separately. A certificate of analysis should list mitragynine and 7-OH as distinct peaks from HPLC analysis. At 7OH North every batch is third-party tested for both — see [our lab results](/lab-results) or read [why third-party testing matters](/blog/importance-of-lab-testing). ## Which Should You Research? It depends on what you are actually studying. Traditional kratom leaf powder gives you a full alkaloid spectrum dominated by mitragynine. Isolated 7-OH tablets give you a precise, reproducible dose of a single compound — better for studies where variable inputs would be a confound. Canadian researchers can browse our [full catalogue](/shop) for both formats, or start with our [comparison of product types](/blog/comparing-kratom-product-types) if you are unsure which suits your work. ## The Takeaway Mitragynine is the bulk alkaloid — abundant, stable, the historical face of kratom. 7-OH is the minor alkaloid that punches far above its weight, requires careful preservation, and delivers dose precision in modern tablet form. Both have distinct places in research; they are not interchangeable. *Products are sold for research purposes. Not for human consumption.*