What is in Kratom? A Brief look at Mitragyna Speciosa’s Alkaloid and Nutritional Profile

Have you ever been curious about the makeup of the west’s new favorite black sheep of the tea drinking world? Kratom has been recorded as being used by people in Southeast Asia for the past 150 years (1), and many believe it has been used medicinally by indiginous peoples for longer than that–potentially up to thousands of years. Green tea drinking is thought to be a roughly 5,000 year old practice in the east. 

Nowadays, kratom has repeatedly claimed national spotlight as a controversial supplement. It is used by chronic pain sufferers, people struggling with addiction and/or depression, and regular people looking for an alternative to coffee or tea to boost their day. The plant has been shown to have a wealth of benefits, and despite a ruthless ongoing propaganda smear campaign, it is regularly consumed by up to five million people, according the American Kratom Association(2). But what is actually in kratom? Let’s take a brief dive into its pharmacological profile.

Surprisingly, there have been over 40 alkaloids discovered to be a part of this plant(3). The one everyone talks about is Mitragynine, which is solely native to the kratom plant. Mitragynine’s benefits are well documented, as well as its cousin alkaloid, 7-hydroxamitragynine. Users report increased energy and alertness, mood boost, cessation of pain, and mood lifting effects. Among the alkaloids present in kratom, there also exist some flavonoids–compounds found naturally in many fruits, vegetables and green tea–in addition to terpenoid saponins, polyphenols, and glycosides(4). Many of these alkaloids are thought to have activity in the body, like corynantheidine, which is thought to affect serotonin receptors(5). While further research needs to be done on the remaining compounds to determine the complete picture of kratom’s biological activity and contraindications, what has been shown so far indicates a complex composition with numerous potential applications as a supplement or medicinal tea. 

Interestingly, current research indicates the presence of the various flavonoids may be beneficial in free radical scavenging (those pesky cancer causing, cell damaging agents found in the body), as well as having antimicrobial activity(6), though to what extent remains to be seen. In this post-coronavirus age, anything along these lines may seem promising, but it would be prudent to suggest that you ignore any information claiming kratom prevents or treats viral infections. This is not backed by current scientific consensus. Kratom is similar in the antioxidant (anti free radical) aspect to green tea and certain other plants. More information about the antimicrobial aspect can be found in the referenced study.

What about nutrition? Similarly to coffee and tea, base nutritional aspects of kratom leaves are going to be relatively benign. For the calorie counters out there, you can expect two grams to contain around 7.4 calories. Other nutrients and minerals(7):

(in a 2g serving)

Sodium – less than 0.1mg

Iron – 0.5mg

Calcium – 13.2mg

Potassium – 18.5mg

Carbohydrates – 1.5g

Protein – 0.2g

Fats – less than 0.1g


For anyone that regularly tracks nutrition information, you’re going to look at that list and most likely chuckle. Really, the only source of any concern would be from the iron content, which could grow to questionable levels at daily doses of >16g, especially in men. Though it’s important to note that the body is able to regulate the absorption of iron and fiber in plant based sources pretty efficiently. Still, for individuals consuming large amounts on a daily basis, it might be good to consider this information. Some of the above nutrients may change in quantity if tea is brewed from the leaves, rather than consumed whole or as a powder.

Ironically (no pun intended), iron absorption (specifically non-heme iron) has been shown to decrease with excessive green tea drinking (8,9). While I couldn’t find any information regarding Kratom’s tannins–the compounds in green tea thought to block some mineral absorption–it stands to reason that if you consume green tea or possibly even kratom itself in low to moderate doses, you’re already regulating iron absorption.

So there you have it, if you’ve ever wondered exactly what is in kratom, now you know. Nutritionally, it isn’t going to help or hinder (in minimal or moderate usage), and pharmacologically the plant is–from all available research–rife with potential benefits. 

[1] https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6612999/

[2] ttps://www.discovermagazine.com/health/the-us-may-ban-kratom-but-are-its-effects-deadly-or-lifesaving

[3] https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6473843/

[4] http://www.emcdda.europa.eu/publications/drug-profiles/kratom_en

[5] https://pubmed.ncbi.nlm.nih.gov/2991775/

[6] https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6255380/

[7] https://demo.soapkorner.com/wp-content/uploads/2020/04/378035667706-1.pdf

[8] https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5093162/

[9] https://www.nytimes.com/2009/06/30/health/30real.html