Kraatje's Kratom lab-tests

At kraatje we only sell lab-tested kratom from certified Indonesian suppliers and farmers. Below is an overview of our latest test results for all of our current strains.

Our Kratom goes to a through a whole cycle before reaching us. From finding the right suppliers, to supporting the right farmers, processing the product and sterilising, testing and homogenizing it before it gets shipped to the Netherlands. Read on how we source, proces, sterilise our kratom

The lab-results show an alkaloid profile, with Mitragynine levels, 7-OH levels, heavy-metal analysis, other prominent alkaloids and the total alkaloid percentage

Why do red strains have lower Mitagynine than green or white strains?

Mitragynine percentages are often higher in white and green strains than in red strains. A lower mitragynine percentage doesn't make a red strain weaker or lower in quality, it reflects a different alkaloid profile. Red strains undergo deeper fermentation, which changes that profile and reduces the mitragynine level. Within the kratom community, green and white strains are often associated with daytime use and red strains with the evening, a distinction users put down to their different alkaloid profiles. Kratom lab tests measure 7 of the most prominent alkaloids in the plant. Mitragynine is the most common, usually making up over 60% of the total alkaloid content, which makes it the dominant alkaloid. So be wary of judging a strain's "strength" on its mitragynine result alone. Other alkaloids differ from strain to strain, and every strain has its own profile, which is why there's no single "best" strain. It comes down to finding the one that's right for you.

Heavy metals in kratom and how we keep ours in check

Like any plant that grows in soil, kratom (Mitragyna speciosa) draws up trace amounts of heavy metals as it matures. The minerals in the ground, rainwater, the air around the farm all of it leaves a faint fingerprint in the leaf. This isn't unique to kratom; it's true of tea, coffee, herbs and spices alike. The only way to know what a harvest actually contains is to test it.

That's why every batch in our range is screened by an independent laboratory using ICP/MS, one of the most sensitive methods available, able to detect metals down to fractions of a milligram per kilogram.

Our voluntary maximum limits

Together with experienced toxicologists, we've defined our own maximum limits and we've set them deliberately tight. Each one sits at or below the European Union's maximum levels for food supplements, and below the World Health Organization's guideline values for botanical materials. A batch has to fall under every one of these thresholds before it earns a place in our collection.

Heavy Metal	Why we screen for it	Kraatje.eu Max (ppm)	EU Food Supplement Max (ppm)
Arsenic (As)	Metalloid with potentially hepatotoxic effects	1.0	Not set*
Cadmium (Cd)	Heavy metal that can accumulate in the body	1.0	1.0
Lead (Pb)	Neurotoxic metal	1.5	3.0
Mercury (Hg)	Potent neurotoxin	0.10	0.10

*The EU sets no general heavy-metal limit for arsenic in food supplements; it regulates inorganic arsenic only in specific food categories. Our 1.0 ppm limit follows the World Health Organization's guidance for botanical materials. EU food-supplement levels per Regulation (EU) 2023/915.

What our results show

Run your eye down the result tables on this page and you'll spot the same pattern on every strain: the measured values land well beneath our limits, usually a small fraction of them. Lead, the metal worth watching most closely in any botanical, stays comfortably under our 1.5 ppm ceiling across the entire range, while arsenic, cadmium and mercury come in lower still. This is the result of direct sourcing from trusted farms, organic processing, and a lab check on every single batch before it ships.

How to read the figures

Results are listed in milligrams per kilogram (mg/kg), the same unit as parts per million (ppm). Compare each value against our maximum for that metal, every figure should sit well below it. If a batch crosses even one threshold, we do not sell it, simple as that.

Certified Lab-Tests By Murray Brown Labs

If you want to see the original lab-test results provided by Murray Brown. Go to the product page of one of our Kratoms. You can find it under the product pictures. Murray Brown is a certified Laboratory in the U.S. that specializes in Kratom Lab-tests. They use modern techniques and technology that very accurately determines the alkaloid levels and heavy metals levels in kratom powder. View an overview of the results below

Lab Results — Green Malay Kratom
Compound	Result
Alkaloids (% w/w)
Mitragynine	1.25
Speciociliatine	0.326
Paynantheine	0.215
Speciogynine	0.142
7-Hydroxymitragynine	< 0.800
Isorhynchophylline	< 0.0455
Mitraphylline	< 0.0455
Total Alkaloids	1.93
Heavy Metals (mg/kg)
Arsenic (As)	0.462
Cadmium (Cd)	0.0181
Lead (Pb)	0.479
Mercury (Hg)	0.0227

Lab Results — White Elephant Kratom
Compound	Result
Alkaloids (% w/w)
Mitragynine	1.61
Speciociliatine	0.296
Paynantheine	0.276
Speciogynine	0.188
7-Hydroxymitragynine	< 0.800
Isorhynchophylline	< 0.0461
Mitraphylline	< 0.0461
Total Alkaloids	2.37
Heavy Metals (mg/kg)
Arsenic (As)	0.138
Cadmium (Cd)	0.0305
Lead (Pb)	0.679
Mercury (Hg)	0.0166
Results apply only to the tested batch. Analysis by Murray-Brown Laboratories, Inc. (alkaloids: HPLC-UV, AOAC 2017.14 modified; metals: ICP/MS, AOAC 2015.01 modified).

Lab Results — Super Maeng Da Kratom
Compound	Result
Alkaloids (% w/w)
Mitragynine	1.62
Speciociliatine	0.341
Paynantheine	0.272
Speciogynine	0.187
7-Hydroxymitragynine	< 0.800
Isorhynchophylline	< 0.0480
Mitraphylline	< 0.0480
Total Alkaloids	2.42
Heavy Metals (mg/kg)
Arsenic (As)	0.360
Cadmium (Cd)	0.0257
Lead (Pb)	0.667
Mercury (Hg)	0.0163
Results apply only to the tested batch. Analysis by Murray-Brown Laboratories, Inc. (alkaloids: HPLC-UV, AOAC 2017.14 modified; metals: ICP/MS, AOAC 2015.01 modified).

Lab Results — Super Green Kratom
Compound	Result
Alkaloids (% w/w)
Mitragynine	1.24
Speciociliatine	0.373
Paynantheine	0.216
Speciogynine	0.146
7-Hydroxymitragynine	< 0.800
Isorhynchophylline	< 0.0412
Mitraphylline	< 0.0412
Total Alkaloids	1.97
Heavy Metals (mg/kg)
Arsenic (As)	0.245
Cadmium (Cd)	0.0296
Lead (Pb)	0.774
Mercury (Hg)	0.0205
Results apply only to the tested batch. Analysis by Murray-Brown Laboratories, Inc. (alkaloids: HPLC-UV, AOAC 2017.14 modified; metals: ICP/MS, AOAC 2015.01 modified).

Lab Results — Stem and Vein Kratom
Compound	Result
Alkaloids (% w/w)
Mitragynine	0.552
Speciociliatine	0.485
Paynantheine	0.118
Speciogynine	0.0640
7-Hydroxymitragynine	< 0.800
Isorhynchophylline	< 0.0471
Mitraphylline	< 0.0471
Total Alkaloids	1.22
Heavy Metals (mg/kg)
Arsenic (As)	0.131
Cadmium (Cd)	0.0423
Lead (Pb)	1.25
Mercury (Hg)	< 0.00500
Results apply only to the tested batch. Analysis by Murray-Brown Laboratories, Inc. (alkaloids: HPLC-UV, AOAC 2017.14 modified; metals: ICP/MS, AOAC 2015.01 modified).

Lab Results — Red Thai Maeng Da Kratom
Compound	Result
Alkaloids (% w/w)
Mitragynine	1.14
Speciociliatine	0.333
Paynantheine	0.191
Speciogynine	0.134
7-Hydroxymitragynine	< 0.800
Isorhynchophylline	< 0.0454
Mitraphylline	< 0.0454
Total Alkaloids	1.80
Heavy Metals (mg/kg)
Arsenic (As)	0.188
Cadmium (Cd)	0.0147
Lead (Pb)	0.979
Mercury (Hg)	0.0154
Results apply only to the tested batch. Analysis by Murray-Brown Laboratories, Inc. (alkaloids: HPLC-UV, AOAC 2017.14 modified; metals: ICP/MS, AOAC 2015.01 modified).

Lab Results — Red Sumatra Kratom
Compound	Result
Alkaloids (% w/w)
Mitragynine	0.845
Speciociliatine	0.262
Paynantheine	0.148
Speciogynine	0.116
7-Hydroxymitragynine	< 0.800
Isorhynchophylline	< 0.0488
Mitraphylline	< 0.0488
Total Alkaloids	1.37
Heavy Metals (mg/kg)
Arsenic (As)	0.184
Cadmium (Cd)	0.0268
Lead (Pb)	0.527
Mercury (Hg)	0.0146
Results apply only to the tested batch. Analysis by Murray-Brown Laboratories, Inc. (alkaloids: HPLC-UV, AOAC 2017.14 modified; metals: ICP/MS, AOAC 2015.01 modified).

Lab Results — Red Hulu Kapuas Kratom
Compound	Result
Alkaloids (% w/w)
Mitragynine	0.949
Speciociliatine	0.293
Paynantheine	0.172
Speciogynine	0.129
7-Hydroxymitragynine	< 0.800
Isorhynchophylline	< 0.0460
Mitraphylline	< 0.0460
Total Alkaloids	1.54
Heavy Metals (mg/kg)
Arsenic (As)	0.548
Cadmium (Cd)	0.0266
Lead (Pb)	0.869
Mercury (Hg)	0.0199
Results apply only to the tested batch. Analysis by Murray-Brown Laboratories, Inc. (alkaloids: HPLC-UV, AOAC 2017.14 modified; metals: ICP/MS, AOAC 2015.01 modified).

Lab Results — Red Borneo Kratom
Compound	Result
Alkaloids (% w/w)
Mitragynine	1.28
Speciociliatine	0.302
Paynantheine	0.199
Speciogynine	0.140
7-Hydroxymitragynine	< 0.800
Isorhynchophylline	< 0.0493
Mitraphylline	< 0.0493
Total Alkaloids	1.92
Heavy Metals (mg/kg)
Arsenic (As)	0.223
Cadmium (Cd)	0.0140
Lead (Pb)	0.575
Mercury (Hg)	0.0178
Results apply only to the tested batch. Analysis by Murray-Brown Laboratories, Inc. (alkaloids: HPLC-UV, AOAC 2017.14 modified; metals: ICP/MS, AOAC 2015.01 modified).

Lab Results — Red Borneo Classic Kratom
Compound	Result
Alkaloids (% w/w)
Mitragynine	0.994
Speciociliatine	0.262
Paynantheine	0.177
Speciogynine	0.138
7-Hydroxymitragynine	< 0.800
Isorhynchophylline	< 0.0481
Mitraphylline	< 0.0481
Total Alkaloids	1.57
Heavy Metals (mg/kg)
Arsenic (As)	0.122
Cadmium (Cd)	0.0258
Lead (Pb)	0.883
Mercury (Hg)	0.0105
Results apply only to the tested batch. Analysis by Murray-Brown Laboratories, Inc. (alkaloids: HPLC-UV, AOAC 2017.14 modified; metals: ICP/MS, AOAC 2015.01 modified).

Lab Results — Green Hulu Kapuas Kratom
Compound	Result
Alkaloids (% w/w)
Mitragynine	1.60
Speciociliatine	0.276
Paynantheine	0.277
Speciogynine	0.186
7-Hydroxymitragynine	< 0.800
Isorhynchophylline	< 0.0431
Mitraphylline	< 0.0431
Total Alkaloids	2.33
Heavy Metals (mg/kg)
Arsenic (As)	0.132
Cadmium (Cd)	0.0187
Lead (Pb)	0.911
Mercury (Hg)	0.0158
Results apply only to the tested batch. Analysis by Murray-Brown Laboratories, Inc. (alkaloids: HPLC-UV, AOAC 2017.14 modified; metals: ICP/MS, AOAC 2015.01 modified).

Lab Results — Great White Kratom
Compound	Result
Alkaloids (% w/w)
Mitragynine	1.27
Speciociliatine	0.360
Paynantheine	0.224
Speciogynine	0.151
7-Hydroxymitragynine	< 0.800
Isorhynchophylline	< 0.0466
Mitraphylline	< 0.0466
Total Alkaloids	2.01
Heavy Metals (mg/kg)
Arsenic (As)	0.199
Cadmium (Cd)	0.0150
Lead (Pb)	0.760
Mercury (Hg)	0.0162
Results apply only to the tested batch. Analysis by Murray-Brown Laboratories, Inc. (alkaloids: HPLC-UV, AOAC 2017.14 modified; metals: ICP/MS, AOAC 2015.01 modified).

Lab Results — Super Red Borneo Kratom
Compound	Result
Alkaloids (% w/w)
Mitragynine	0.641
Speciociliatine	0.206
Paynantheine	0.114
Speciogynine	0.0830
7-Hydroxymitragynine	< 0.800
Isorhynchophylline	< 0.0473
Mitraphylline	< 0.0473
Total Alkaloids	1.04
Heavy Metals (mg/kg)
Arsenic (As)	0.402
Cadmium (Cd)	0.0137
Lead (Pb)	0.361
Mercury (Hg)	0.0222
Results apply only to the tested batch. Analysis by Murray-Brown Laboratories, Inc. (alkaloids: HPLC-UV, AOAC 2017.14 modified; metals: ICP/MS, AOAC 2015.01 modified).

Lab Results — Green Borneo Kratom
Compound	Result
Alkaloids (% w/w)
Mitragynine	1.51
Speciociliatine	0.290
Paynantheine	0.239
Speciogynine	0.168
7-Hydroxymitragynine	< 0.800
Isorhynchophylline	< 0.0479
Mitraphylline	< 0.0479
Total Alkaloids	2.20
Heavy Metals (mg/kg)
Arsenic (As)	0.327
Cadmium (Cd)	0.0161
Lead (Pb)	0.383
Mercury (Hg)	0.0300
Results apply only to the tested batch. Analysis by Murray-Brown Laboratories, Inc. (alkaloids: HPLC-UV, AOAC 2017.14 modified; metals: ICP/MS, AOAC 2015.01 modified).