Evidence-based·Last reviewed May 30, 2026·How we grade evidence

Cetyl Myristoleate

Fatty-acidBest with a meal

Useful mainly for people with osteoarthritis willing to try a low-evidence adjunct after first-line options.

Quick decision guide

May help most

people with osteoarthritis willing to try a low-evidence adjunct after first-line options

Common dosing range

350–550 mg twice daily (1,000–2,000 mg/day as a cetylated fatty acid complex)

When to expect effects

Weeks (4–8)

Watch out for

human evidence is small; not a substitute for proven osteoarthritis care

What is it

Cetyl myristoleate (CMO) is a fatty acid ester (cetyl ester of myristoleic acid) that was patented in the 1970s by NIH researcher Harry Diehl. It is marketed as a joint health supplement, particularly for osteoarthritis and rheumatoid arthritis.

Is it worth it for you?

Use this as a quick fit check, not a diagnosis.

Worth considering if…

You have osteoarthritis and want to trial a well-tolerated adjunct
You have already tried better-evidenced options like exercise and weight management

Probably skip if…

You want strong, well-replicated evidence
You expect it to treat rheumatoid arthritis
You are pregnant, breastfeeding, or on anticoagulants

Evidence at a glance

osteoarthritis pain

Mixed Evidence
Effect
Modest, uncertain
Best fit
adults with knee or other joint osteoarthritis
Time
4–8 weeks

Evidence for 1 use

AI-assisted evidence assessment — talk to your doctor before relying on any single supplement.

osteoarthritis pain

Supplement benefit
Mixed Evidence

A few small human trials suggest cetyl myristoleate, taken orally or applied topically, may improve osteoarthritis pain and joint function. The evidence base is much smaller than for glucosamine, chondroitin, or curcumin, and rests heavily on the original 1970s patent and animal data. Effects are modest and not well replicated.

Effect size
Modest, uncertain
Time to effect
4–8 weeks
Best fit
adults with knee or other joint osteoarthritis
Less likely
people expecting disease-modifying or cartilage-regenerating effects

Bottom line: May modestly ease osteoarthritis pain, but the human evidence is thin.

SourceLee et al., 2017 — PMCHesslink et al., 2002 — PubMed

How it works

The proposed mechanism is anti-inflammatory: CMO may modulate inflammatory pathways involved in joint disease, possibly affecting prostaglandin production and lubrication of joint surfaces. The original animal studies suggested protection from adjuvant-induced arthritis in mice. Human clinical trials are limited. A few small studies have suggested benefits for osteoarthritis pain and function, but the research base is much smaller than for glucosamine, chondroitin, or curcumin. Most product marketing rests heavily on the original patent and early animal data rather than robust human trials. CMO is often sold as a 'complex' alongside related cetylated fatty acids (cetyl myristate, cetyl palmitate, cetyl oleate). These are similar esters with overlapping properties.

How to take it

1. Typical dose
350–550 mg twice daily
2. Timing
Flexible; with meals
3. With food
With a meal containing some fat to aid absorption
4. How long to try
Trial 4–8 weeks before judging joint effects

What to track

joint pain
stiffness
physical function/mobility

2 commercial forms

Compare the main delivery options and what they’re best suited for.

Cetyl myristoleate complex

Most common commercial form.

Often combined with related fatty acid esters.

Topical CMO cream

Used as a complement to oral supplementation.

Applied directly to painful joints.

Safety

Know the common side effects, key cautions, and who should avoid it.

Common side effects

mild GI upset

Who should avoid it

  • pregnant or breastfeeding women
  • children
  • people with bleeding disorders or on anticoagulants (caution)

Pregnancy & breastfeeding

Best avoided in pregnancy and breastfeeding due to limited safety data.

Interactions

anticoagulants/antiplateletsMinor

theoretical effect on platelet function from its fatty acid composition

Choosing a product

What to look for on the label — and what to be skeptical of.

Look for…

clearly stated cetyl myristoleate content
transparent cetylated fatty acid complex breakdown
third-party testing

Be skeptical of…

'cures arthritis'
'rebuilds cartilage'
'permanent joint lubrication'

Frequently asked questions

How does CMO compare to glucosamine?⌄

Glucosamine has vastly more research and better evidence for moderate joint benefits. CMO has small early evidence but less robust support. Some people use both.

How long until I see results?⌄

Most users report effects (if any) within 4-8 weeks. Trials of 60-90 days are typical.

Is CMO worth trying?⌄

If glucosamine, chondroitin, curcumin, and other evidence-based options haven't worked, CMO is generally well-tolerated and worth a 2-3 month trial. Don't expect dramatic effects.

References by claim

osteoarthritis pain

Lee et al., 2017 — PMC (2017) link

Hesslink et al., 2002 — PubMed (2002) link

Track Cetyl Myristoleate with Pilora

Set up dose reminders, check interactions, and join the community in the Pilora iPhone app.

Coming to App Store
Evidence-based·Last reviewed May 30, 2026·Evidence current as of May 30, 2026·How we grade evidence

Disclaimer: These statements have not been evaluated by the FDA. This page is educational, not a substitute for personalized medical advice. Evidence grades are AI-assisted assessments — talk to your doctor before starting any new supplement, especially if you’re pregnant, breastfeeding, on medications, or managing a chronic condition.