An over-the-counter arthritis supplement was found hiding a prescription steroid that can quietly shut down the adrenal glands

Laboratory testing of a popular over-the-counter arthritis supplement has repeatedly turned up a prescription-strength steroid that never appears on its label, a discovery that has alarmed physicians treating patients for unexplained adrenal problems. The product, sold under names including Artri King, illustrates a broader pattern in which supplements marketed for joint pain contain undisclosed pharmaceutical ingredients capable of causing real and sometimes lasting harm.

What testing found inside Artri King

Laboratory analyses of Artri King and closely related arthritis products have identified three undeclared pharmaceutical ingredients: the corticosteroid dexamethasone, the anti-inflammatory drug diclofenac, and the muscle relaxant methocarbamol. None of the three appears on the product labeling, which typically lists only herbal or botanical ingredients, leaving consumers with no way to know they are taking a mix of prescription-strength medications alongside whatever natural components the supplement does contain. Testing has found the concentrations of these hidden drugs vary between batches, meaning even a longtime user of the product has no reliable way to predict the actual dose they are consuming from one bottle to the next.

How a hidden steroid can shut down the adrenal glands

Dexamethasone is a potent corticosteroid that suppresses inflammation quickly, which is why users of these supplements often report fast, dramatic relief from joint pain that keeps them coming back to the product. That same potency is the danger: taken repeatedly without a doctor’s knowledge, dexamethasone signals the body’s hypothalamic-pituitary-adrenal axis to scale back its own natural cortisol production. Over weeks or months, the adrenal glands can grow so accustomed to an external steroid supply that they lose the capacity to produce adequate cortisol on their own, a condition known as adrenal insufficiency. Because the person taking the supplement has no idea a steroid is involved, stopping the product abruptly, or simply running out, can trigger a sudden and dangerous drop in cortisol known as an adrenal crisis, which can cause severe vomiting, confusion, and a life-threatening drop in blood pressure if left untreated, a mechanism documented in a case series published through the National Library of Medicine’s PMC archive.

The added risks from diclofenac and methocarbamol

Diclofenac, a nonsteroidal anti-inflammatory drug, carries its own risks of gastrointestinal bleeding and kidney damage, particularly when taken at unknown doses or combined with other pain relievers a patient may already be using for the same joint condition. Methocarbamol, a muscle relaxant, adds sedation and drowsiness that can be dangerous when combined with alcohol, other central nervous system depressants, or when a patient does not realize they are taking a sedating drug at all and continues driving or operating machinery as usual. Layered on top of a hidden steroid, the combination can mask the underlying signs of a worsening medical problem rather than treating it, since the steroid’s anti-inflammatory effect can make a patient feel improved even as damage continues elsewhere in the body.

Why unapproved ingredients can slip past regulators

Dietary supplements sold in the United States do not require premarket approval from the Food and Drug Administration the way prescription drugs do, and manufacturers are legally responsible for ensuring their own products are safe before they reach store shelves. Regulatory action tends to happen only after adverse events are reported, meaning tainted products can circulate for months or years before testing catches up to them. Products like Artri King, often marketed within specific immigrant or ethnic communities and sold through informal retail channels as well as online marketplaces, can be especially difficult for regulators to track and remove, since a product pulled from one storefront can reappear under a similar name or slightly altered label soon after.

A pattern that has surfaced before

Artri King is not the first arthritis supplement found to contain an undisclosed steroid alongside an anti-inflammatory drug and a muscle relaxant; regulators have previously warned about other joint-pain products marketed to Spanish-speaking communities that carried a strikingly similar combination of hidden ingredients. That recurrence suggests the practice of quietly lacing an herbal-labeled product with fast-acting prescription drugs is not a one-time manufacturing error but a recognizable pattern across multiple brands, a point reinforced by a separate review of unregulated arthritis supplements published in PMC, which is part of why physicians in regions with large numbers of affected patients have grown accustomed to asking specifically about arthritis supplements when a patient presents with unexplained adrenal symptoms.

Recognizing the warning signs of adrenal insufficiency

Fatigue that does not improve with rest, unexplained weight loss, low blood pressure, nausea, and dizziness upon standing are common signs that the adrenal glands are not producing enough cortisol. Anyone who has used an arthritis supplement of unknown origin and develops these symptoms is generally advised to seek medical evaluation rather than simply stopping the product on their own, since an abrupt halt after long-term hidden steroid exposure can itself provoke a medical emergency. Blood testing can confirm whether cortisol levels have dropped and guide a safe, gradual tapering process if a hidden steroid is identified as the cause, a process that typically takes weeks to months depending on how long the supplement was used.

This article was produced with the assistance of AI and reviewed by Morning Overview editors prior to publication.

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