Posted by King K
on October 05, 2026
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This OPMS kratom review is built from documents, because that is where the hard facts about this brand are. OPMS sells extract capsules and liquid extracts under the names Gold and Black, plus a Silver line its own FAQ says is not really an extract, through distributors and shops rather than a checkout of its own. It is also the subject of an FDA safety alert, dated 26 July 2024, on one product: OPMS Black Liquid Kratom.
If you are here because something went wrong after using a kratom product, read this part first. If someone is difficult to wake, is not breathing normally, or is unresponsive, call 911.
Poison Control is 1-800-222-1222, around the clock, about a product in your hand. The crisis lifeline is 988, by call or text. The federal treatment locator is findtreatment.gov.
Two things stated plainly. Kratom is not a treatment for opioid use disorder, and it is not a treatment for opioid or kratom withdrawal. The medicines with an evidence base behind them are buprenorphine, methadone and naltrexone. And we are a seller, not a clinic, so every clinical question raised on this page belongs with a clinician or one of the numbers above rather than with us.
Who wrote this, and what we sell
Checked 1 October 2026. King K wrote this review and sells liquid kratom extracts (Gold, Silver and Platinum) and Rush energy shots (Diamond, Emerald and Ruby) that compete directly with OPMS liquids, so read it as a competitor's review. Our Gold and Silver are King K products, not OPMS products; the range is on the King K collection page.
No store in our group (King K, GRH Kratom, GUD Tonics, Rebel X Brands and kemalwhyte.com) lists an OPMS product as of 1 October 2026, and Rebel X Brands does not distribute OPMS. OPMS did not commission or pay for this review and has not seen it. It contains no affiliate links. We are not affiliated with or endorsed by OPMS, Martian Sales, Inc. or Choice Organics, and the OPMS names are trademarks of their owner.
Corrections: use the contact page on kingkkratom.com. Questions about our own products: our FAQ page.
How we reviewed it
Documents only, read on 1 October 2026. We did not buy, taste, dose or lab-test any OPMS product. We read opmskratom.com and its label images, the FDA alert and roundup, the FDA's general kratom page, FDA's court filings, Martian Sales' complaint against the FDA, federal dockets naming Martian Sales, the Georgia complaint, a ClassAction.org summary of one California suit, two DEA Federal Register notices, the AKA's GMP program page and vendor list, a Business Wire release, one Tampa Bay Times report and the one certificate we found. There is no score, star rating or grade. The verdict is in words, and it is a verdict on documents.
OPMS kratom review: the quick verdict
There is a great deal of paperwork about OPMS, and very little from it.
What the documents show. Gold and Black extract capsules, Gold and Black liquid extracts, and Silver capsules and powders, at suggested prices from $5.99 to $77.99. Two old card images with mitragynine per capsule printed on them. A listing as an AKA GMP Qualified vendor. An FDA safety alert on Black Liquid, still live on 1 October 2026 with no recall attached, and a lawsuit by the trademark owner to remove or modify it that has waited since December 2024 for a ruling on FDA's motion to dismiss.
What is missing. Alkaloid figures for any liquid on the brand's own site. Any certificate the brand publishes. An alkaloid result on the one certificate we found. A named manufacturer.
Who would want more. Anyone who wants to know how much mitragynine is in the card or bottle in front of them. Nothing we read on the brand's site can tell you.
Who OPMS is, and who says it is not the seller
Nothing on opmskratom.com names a legal entity as the owner of the site. Court filings name the trademark owner as Martian Sales, Inc., a Wyoming corporation. And Martian Sales has sworn that it does not make or sell the products.
The FDA, quoting a 2021 declaration filed for Martian Sales in an Oregon case, says the company "licensed the exclusive right to use the O.P.M.S. trade names and marks to a third party for use in connection with products manufactured, distributed or sold by that third party." A 2024 affidavit, also quoted by the FDA, says it "does not directly sell products to individuals."
The distributor named on the brand's own pages is Choice Organics, with a Los Angeles address on the disclaimer page and an Allen, Texas address in the terms. The homepage claims leadership in kratom extracts "since 2010"; the About page says "for more than 5 years". In December 2023 the Tampa Bay Times reported finding no evidence that O.P.M.S. or Optimized Plant Mediated Solutions is a registered company anywhere in the United States.
None of this describes what is in a bottle. It does mean the trademark owner and the distributor named on the site are not the same company.
The line-up: OPMS Gold, Black, Silver and the liquids
OPMS Gold capsules come on blister cards of 2, 3 and 5 only, and have since April 2014; the site calls larger counts and loose capsules fakes. The FAQ says the extract is made from Green Vein Maeng Da. Suggested prices are $17.99, $26.49 and $43.49.
OPMS Black capsules, a full-spectrum extract by the brand's description, have come only in counts of 2, 3 and 5 since March 2021, at $17.99, $25.99 and $41.99.
Gold Liquid and OPMS Black Liquid are $17.99 a bottle. Product pages say 8ml; authenticity pages say one size, 8.8ml. The FAQ says the formulas differ. On 1 October 2026 Black Liquid was still listed in the navigation, on its own page and on the price list. A Red Liquid appears only in homepage images.
OPMS Silver comes in seven blends, as capsules and powders, and the FAQ calls it a "1-time strength" product rather than an extract. Capsule bags run from $5.99 to $77.99.
These are the brand's suggested retail prices, as listed on opmskratom.com on 1 October 2026. Shops set their own, and the list page still opens with COVID-19 era text about closed stores.
The label figures are thinner than the catalog. The only alkaloid numbers we found on the site are on two old card-back images. The Black 2-count card, printed lot "LT 21071" and dated by its file name to March 2021, lists mitragynine at 48 per cent, or 148mg per capsule. The Gold 2-count card, lot "LT 20036", a low-resolution image whose file name dates it to August 2020, lists 42 per cent, or 84mg per capsule. We found no alkaloid figure for any liquid or for Silver anywhere on the site. (Our explainer on kratom extracts and potency covers how strength is stated.)
Both images are five years old or more. Cards on a shelf in 2026 may print different figures, and nothing on the site says whether they do.
The arithmetic, once. A Black 2-count at its $17.99 suggested price holds 2 x 148mg = 296mg on the 2021 card, and $17.99 divided by 296, times 100, is about $6.08 per 100mg of mitragynine. Gold comes to about $10.71 on its 2020 card. Both rest on old card images, not on a current label. We found no figure for the liquids to divide by.
OPMS gives maximum-use limits, not a serving size. We do not repeat the limits here, because this page gives no dosing advice.
The FDA safety alert on OPMS Black Liquid
On 26 July 2024 the FDA published a Safety Alert headed "FDA Warns Consumers Not to Use Optimized Plant Mediated Solutions (OPMS) Black Liquid Kratom", and announced it in its roundup of the same day.
The core of it, verbatim: "The FDA is advising consumers not to consume OPMS Black Liquid Kratom, which is sold online and in some retail stores. OPMS Black Liquid Kratom has been linked to serious adverse health effects, including death." Then: "The FDA recently received an adverse event report of a person who died after using OPMS Black Liquid Kratom. This is one of many reports of serious adverse events individuals have reported experiencing after consuming OPMS Black Liquid Kratom." On the label: "The product label for OPMS Black Liquid Kratom indicates the presence of kratom alkaloids, mitragynine and 7-hydroxymitragynine (7-OH mitragynine)." And: "The FDA is investigating these complaints."
What the alert does not contain matters as much. No laboratory result; the alkaloids it names come from the label. No count beyond one death report and "many reports". No date, place or age for the death. No recall, and no instruction to retailers. No company, no lot number, and no other OPMS product: not Gold, not Silver, not Black capsules, not Gold Liquid. The recall and seizure links at the foot of the page concern other kratom products. On 1 October 2026 the page was still live, marked "Content current as of: 07/26/2024".
"A person who died after using" describes an order of events. The alert states no finding about cause.
Martian Sales v. FDA, and what the FDA told the court
Martian Sales, Inc. sued the FDA on 23 October 2024 in the U.S. District Court for the District of Columbia, case 1:24-cv-03031-RBW, under the Administrative Procedure Act and the Fifth Amendment, asking that the alert be removed or modified. The complaint alleges the alert was a false, punitive "sanction" issued without evidence, that at an FDA inspection of an OPMS distributor on 29 August 2024 FDA staff said the death report rested on an anonymous call, and that FDA requested no market action and initiated no recall. Those are allegations. FDA's filing disputes that the alert lacked a basis, but not that FDA requested no market action.
FDA moved to dismiss on 23 December 2024, arguing lack of standing and that a safety alert is not final agency action. Its memorandum says FDA counsel emailed the company's counsel on 2 August 2024 that a "January 15, 2024 autopsy report indicated that an individual died from accidental acute mitragynine intoxication," and that FDA had learned "that the decedent had purportedly been using your OPMS Black Liquid Kratom products before his death." It says FDA contacted the phone number and email on the Black Liquid packaging on 31 May 2024 but "received no response before issuing the Safety Alert on July 26, 2024."
Note "purportedly". It is FDA's word. An autopsy finding of mitragynine intoxication names a kratom alkaloid, not a brand. The Georgia complaint described below alleges a death in December 2021; no source we read shows it is the death behind the alert.
Since FDA's motion, the docket shows status conferences continued by orders of 22 May 2025, 20 August 2025 and 29 June 2026, with the court "requiring additional time to consider the pending motion to dismiss". The last entry, on 10 September 2026, sets or resets hearings; we could not see its text. No ruling appears on the docket. The alert stays up while the motion waits.
The other lawsuits, as allegations
Each item below is an allegation or a docket entry, not a finding, and we name no private person.
Georgia, 2022. A complaint in the State Court of Cobb County, Civil Action File 22-A-1536, alleges that a 23-year-old man died in December 2021 shortly after consuming OPMS Black Liquid Kratom. The defendants include OPMS-named companies, OPMS Wholesale doing business as Choice Organics, Martian Sales and the American Kratom Association. Its status is unknown to us.
California. C.B. v. Martian Sales, Inc. (3:23-cv-00645), a proposed class action alleging, per a published summary, failure to warn that the extracts are addictive, terminated on 17 October 2023, by a route we have not verified. C.M. v. Martian Sales, Inc. (4:23-cv-06202), filed on 30 November 2023 and listed under fraud, is active, and its latest filing is dated 16 September 2026.
New York. J.P. v. Martian Sales, Inc. (1:25-cv-00741), filed on 10 February 2025, ended with the plaintiff's notice of voluntary dismissal on 22 June 2026 and the court's order on 23 June. Settlement terms, if any, are not in anything we read.
Header data shows seven more federal dockets naming Martian Sales or OPMS-linked entities, in Florida, Louisiana (two), Tennessee, Virginia, Nevada and Maryland, one of them brought by the Mayor and City Council of Baltimore. We did not read those pleadings, cannot say whether each concerns an OPMS-branded product, and describe no outcome.
The homepage banner, and what the older labels disclosed
A banner in capitals across the top of the OPMS homepage says, in substance, that the products contain no synthetic form of the other alkaloid the FDA alert names beside mitragynine, and no other synthetic alkaloids. It ends: "NEVER HAD IT. NEVER WILL." A release issued for OPMS on Business Wire in August 2025 welcomed FDA action against concentrated products built on that alkaloid, and said OPMS products are, and always have been, free of harmful synthetic alkaloids.
The working word is "synthetic". OPMS does not say its products contain none of the alkaloid, and its labels list it: the 2021 Black card lists "7-OH-Mitragynine content" at under 2.5 per cent, under 7mg per capsule, and the FDA alert says the Black Liquid label lists it too. No document we read measures it.
No OPMS product on any page we read is named or marketed as mitragynine pseudoindoxyl, "pseudo", MGM-15 or MGM-16, the three compounds the DEA placed in Schedule I by a temporary order effective 26 August 2026. On 27 August Martian Sales sued the DEA in Wyoming (1:26-cv-00254); the complaint is not on the public RECAP archive, so what it challenges we cannot say.
A separate DEA notice of intent of 6 July 2026 proposes scheduling that alkaloid above a threshold, which for extracts includes "greater than 1.00 milligram of 7-hydroxymitragynine in the article". We could not verify whether a final order has followed, and no document we read says whether any OPMS product would exceed it; "under 7mg" on a 2021 label is an upper bound, not a measurement. One point cuts against us too: such a threshold is measured by content, not brand, so it would apply to every kratom extract on the same terms, King K's included.
Certificates: one found, and the brand did not publish it
OPMS's Silver page says it is the only company that tests every batch for alkaloid profile, and that it screens for heavy metals, feces, salmonella and mold. Those are the brand's claims. No page we read on opmskratom.com links to a certificate, names a laboratory or offers a lot lookup.
The only certificate we found sits on a Shopify file server for a store we could not identify. Sante Laboratories, LLC, of Austin, Texas, reported it on 13 May 2024 for "OPMS Gold Liquid Kratom Extract", lot "N/A". The client was Accucell Analytical of Los Angeles, not Martian Sales, Choice Organics or anything called OPMS. It covers microbiology and metals: plate count, yeast and mold, and coliforms below the limit of quantitation; E. coli and Salmonella absent; lead, mercury and arsenic below quantitation; cadmium at 11.3 ppb against a 300 ppb limit, and nickel at 410.1 ppb against 20,000. Every line passes.
There is no mitragynine result, no other alkaloid result and no solvent panel, and the laboratory says results apply only to the sample submitted. We found no certificate of any kind for Black Liquid, Black capsules, Gold capsules or Silver. So the one certificate we found says that a Gold Liquid sample of unknown lot passed microbe and metals limits in spring 2024, and nothing about its strength. For background, see our piece on kratom lab testing.
The AKA GMP listing, and what it covers
OPMS is on the list. "O.P.M.S. Kratom" appears twice on the American Kratom Association's GMP Qualified vendors page, with a "Visit site" link that points to "#".
The AKA's program page calls its certification "facility and process certification versus product certification," and says "The AKA does not endorse the quality of the product". The list page says a listing is not an endorsement and that qualified vendors must complete an annual independent third-party audit, and it shows no audit date, certificate number or expiry for anyone. The AKA was also a co-defendant in the Georgia suit. Read the listing as enrollment in a facility-audit program, not as a statement about any card or bottle. For the record, King K is not on the list as read on 1 October 2026.
Age, where it is sold, and the terms
There is no cart on opmskratom.com. The FAQ says all sales go through authorized distributors and stores, and the price-list page suggests calling smoke shops, gas stations, convenience stores and liquor stores. With no direct shipping, we found no list of places it will not ship to.
Every page carries a "Legal Disclaimer & Safety" notice and footer warnings that list seizures, liver damage, withdrawal, addiction, abuse and death as outcomes reported in publications, and call the product "Only for use as a botanical specimen". The age rule is 18 and over, and 21 in Tennessee. The site-wide warning points readers to FDA's advisories on kratom, and the agency's general kratom page says "kratom is not lawfully marketed in the U.S. as a drug product, a dietary supplement, or a food additive in conventional food."
The terms require binding arbitration and waive class actions and jury trials, and say the waiver expressly covers claims of injury or death. They cap damages at three times the price paid, set a one-year limit on claims, and allow one refund per address in any 12 months.
What a careful buyer can check, and what they cannot
You can check that Gold and Black capsules come on a card of 2, 3 or 5 with a serial number on the back and a black-light feature; the brand says counterfeits sold in bags or loose have been found to contain synthetic cannabinoids or synthetic opioids. You can compare a shelf price with the brand's suggested price. If the product is Black Liquid, the FDA's advice is that consumers should not consume it. On the day you look, you can check whether the FDA alert is live, what the docket shows, and whether OPMS is still on the AKA list.
You cannot check, from anything the brand publishes, how much mitragynine is in a current bottle of Gold, Black or Red Liquid; whether the old card figures match the shelf; any alkaloid result tied to a lot; which facility made the product; or what FDA's investigation found. If that matters, ask the shop for a certificate for the lot on the pack. If there is not one, that is an answer too.
OPMS kratom questions
Did the FDA recall OPMS Black Liquid?
No. The safety alert of 26 July 2024 advises consumers not to consume OPMS Black Liquid Kratom and announces no recall. On 1 October 2026 the brand still listed Black Liquid at a $17.99 suggested retail price.
Does the FDA alert cover OPMS Gold or Silver?
No. It names only OPMS Black Liquid Kratom, with no other OPMS product, no company and no lot number.
How much mitragynine is in OPMS Black?
A 2021 Black capsule card on the brand's site, lot LT 21071, lists 148mg per capsule. We found no current figure on the site, and none at all for Black Liquid.
Does OPMS publish certificates of analysis?
We found none on its site. The one certificate we found is a 2024 microbiology and metals report on a Gold Liquid sample, commissioned by a third party, with no alkaloid results.
Disclaimer: this page summarizes public documents as read on 1 October 2026 and links to primary sources so you can check them. Lawsuit descriptions are allegations unless a court has ruled, and statuses are as the dockets showed on that date. Prices change. It is general information, not legal or medical advice, and no substitute for counsel or for a clinician. Statements about botanical products have not been evaluated by the Food and Drug Administration, and no product is intended to diagnose, treat, cure or prevent any disease.
