Two over-the-counter supplements called palmitoylethanolamide (PEA) and acetyl-L-carnitine (ALC) are emerging as potential pain relievers for fibromyalgia by addressing a root cause: neuroinflammation in the brain. Unlike traditional pain relievers like ibuprofen, which have little effect on fibromyalgia, these supplements work by calming overactive immune cells in the brain that perpetuate chronic pain signals.

What Causes Fibromyalgia Pain to Persist?

Fibromyalgia pain doesn't stem from a single injury or inflammation you can see on an X-ray. Instead, the condition involves a complex chain reaction in the nervous system. When your body experiences an injury or stress, immune cells in your brain called glial cells activate to help resolve the problem. But in fibromyalgia, these cells get stuck in an activated state, continuously releasing chemicals that irritate nerves and amplify pain signals.

This stuck activation creates what researchers call neuroinflammation. Your spinal cord neurons become hyperexcitable, bombarding your brain with pain signals it cannot suppress. Over time, the blood-brain barrier, which normally protects the brain from harmful substances, becomes compromised. This allows immune cells and inflammatory chemicals to enter the brain and further activate glial cells, creating a vicious cycle.

"Neuroinflammation involves a sea of immune and chemical mediators. It's massively complicated," explained Anthony Dickenson, Ph.D., at University College London.

Anthony Dickenson, Ph.D., University College London

How Can PEA and ALC Break This Cycle?

PEA is a naturally occurring fatty acid that works by tempering both mast cell and glial cell activation. Mast cells, found throughout your body and brain, release chemical irritants during neuroinflammation that further activate glial cells. By moderating mast cell activity, PEA helps interrupt the inflammatory cascade without completely shutting down these cells, which perform essential protective functions.

ALC takes a different approach. It reduces the release of glutamate, a pain transmitter, from nerve endings. This minimizes the number of pain signals reaching your central nervous system. When combined, PEA and ALC address neuroinflammation from two angles: calming immune cell activation and reducing pain signal transmission.

Research on PEA has been conducted across multiple pain conditions, including arthritis, low back pain with sciatica, diabetic neuropathy, endometriosis, migraines, and fibromyalgia. The results have generally been favorable, though most studies included relatively small numbers of participants.

What Do Clinical Trials Show About Effectiveness?

Two treatment trials specifically tested PEA as an add-on to existing fibromyalgia therapies. The first study found that adding PEA reduced the number of painful areas and decreased pain scores by 25 percent. The second trial showed that PEA relieved pain and that benefits were maintained over a 15-month study period.

When ALC was added to PEA in combination therapy, three separate trials showed additional symptom relief beyond what either supplement alone provided. A standard dosing approach uses 600 milligrams of PEA and 500 milligrams of ALC taken twice daily.

One 24-month study tracking patients treated with medications and OTC supplements by a team of experts found that 50 percent of patients responded favorably to the combination. Of those responders, 30 percent experienced marked improvement and 20 percent experienced some improvement. Side effects were generally mild and mostly related to the gastrointestinal system.

How to Choose and Use PEA and ALC Supplements

• PEA Particle Size Matters: PEA in its natural form is not absorbed well by the gastrointestinal tract. You must purchase ultra-micronized PEA, a process that reduces particle size to 2,500 times smaller than native PEA to enhance absorption and allow it to reach the brain. Products labeled only as "micronized" have particles that are still 5 to 10 times too large to be effective.
• Look for Specific Dosing: A standard dose combines 600 milligrams of PEA and 500 milligrams of ALC taken twice daily. Experts recommend giving this combination at least three months to assess effectiveness, as it takes time to control neuroinflammation. Avoid ALC doses higher than 500 milligrams per capsule, as higher doses increase side effects without proven additional benefits.
• Expect a Trial Period: Because PEA takes time to provide symptom relief, clinical trials use it as an add-on to existing therapies rather than a standalone treatment. Most studies show mild gastrointestinal side effects at standard doses, with no significant adverse effects reported at 600 milligrams per day of PEA.

One important caveat: nutraceuticals do not have the same regulatory oversight as prescription medications. Supplement manufacturers may claim their products have undergone special processing for maximum absorption, but they are not required to list particle size. When shopping, search specifically for products labeled "ultra-micronized" and be skeptical of products that only say "micronized".

"When we speak about PEA, one must consider what is on the market. You can find very different products," noted Flaminia Coluzzi, M.D., of Sapienza University in Rome. "The ultra-micronized PEA is 2,500 times smaller than the native PEA. Smaller is better."

Flaminia Coluzzi, M.D., Sapienza University in Rome

For fibromyalgia patients whose physicians may not fully understand the condition or how to treat it, PEA and ALC offer an accessible option available without a prescription. While not a cure, these supplements represent a different approach to pain management that targets the underlying neuroinflammatory process rather than simply masking symptoms.