Fatty15 C15:0 Healthy Aging Supplement, 3-Month SupplyBest overall- Dose
- 100 mg C15:0 per capsule (1 or 2 daily)
- Supply
- 3 months
Most recommended by reviewers
Check price at AmazonThe Best C15:0 Supplements
We earn a commission when you buy through our links, at no extra cost to you. How this works.
C15:0, also called pentadecanoic acid, is an odd-chain fatty acid. It is found mostly in whole-fat dairy, so a supplement is mainly for people who avoid dairy or want a more concentrated dose. Look at how much C15:0 each capsule provides, check that the label is clear, and see whether the claims rest on independent evidence rather than the company's own studies.
Our top pick is Fatty15 in the 3-month size. It offers the clearest dose per capsule, though expert opinions on its claims are mixed. The other picks cover budget, higher-dose and dairy-free options.
The rundown
1 Fatty15 C15:0 Healthy Aging Supplement, 3-Month Supply | 2 Fatty15 C15:0 Healthy Aging Supplement, 6-Month Supply | 3 Codeage Liposomal C15:0 with CoQ10 and Astaxanthin | 4 Lithorvexalyn Pentadecanoic Acid C15:0, 120 Tablets | 5 Samareniq Pentadecanoic Acid Supplement, 1 Pack | |
|---|---|---|---|---|---|
| Best for | Best overall | Best value per month | Best with added nutrients | Best budget high dose | Best budget single bottle |
| Dose | 100 mg C15:0 per capsule (1 or 2 daily) | 100 mg C15:0 per capsule (1 or 2 daily) | 150 mg C15:0 per capsule | 800 mg C15:0 per tablet | 300 mg C15:0 per capsule |
| Supply | 3 months | 6 months | 30 servings | Not listed | 1 pack |
| Check price at Amazon | Check price at Amazon | Check price at Amazon | Check price at Amazon | Check price at Amazon |
Fatty15 C15:0 Healthy Aging Supplement, 3-Month SupplyBest overall
Fatty15 C15:0 Healthy Aging Supplement, 6-Month SupplyBest value per month- Dose
- 100 mg C15:0 per capsule (1 or 2 daily)
- Supply
- 6 months
Codeage Liposomal C15:0 with CoQ10 and AstaxanthinBest with added nutrients- Dose
- 150 mg C15:0 per capsule
- Extras
- 150 mg CoQ10, 10 mg astaxanthin
- Supply
- 30 servings
Lithorvexalyn Pentadecanoic Acid C15:0, 120 TabletsBest budget high dose- Dose
- 800 mg C15:0 per tablet
- Count
- 120 tablets
Samareniq Pentadecanoic Acid Supplement, 1 PackBest budget single bottle- Dose
- 300 mg C15:0 per capsule
- Supply
- 1 pack
1Best overall
Fatty15 C15:0 Healthy Aging Supplement, 3-Month Supply
The most-reviewed C15:0 product, with a clear dose and independent testing.
- Dose
- 100 mg C15:0 per capsule (1 or 2 daily)
- Supply
- 3 months
Most recommended by reviewers
Check price at AmazonPrices and availability on Amazon change often.
Why it wins
- Clear dose per capsule
- Independently tested
One catchExpert reviews are split on whether it is worth the price.
Why it's our top pick
Fatty15 gives a clearly stated 100 mg of C15:0 per capsule and is independently tested, which is more than most products in this set offer. One expert review recommends it for people on vegan or dairy-free diets and notes no smell, taste or side effects.
The catch is that the evidence for its wider claims is thin. CSPI advises saving your money, and ConsumerLab notes there are no clinical studies backing its promoted uses, so buy it for the C15:0 dose and not for the health promises.
2Best value per month
Fatty15 C15:0 Healthy Aging Supplement, 6-Month Supply
The same product as the 3-month pack, bought in a bigger size.
- Dose
- 100 mg C15:0 per capsule (1 or 2 daily)
- Supply
- 6 months
Prices and availability on Amazon change often.
Pros
- Same clear dose per capsule
- Lower cost per month than the 3-month pack
Cons
- Higher up-front cost
- Same unproven health claims
Why we like it
If you have decided to try Fatty15, the 6-month pack brings the monthly cost down. You get the same capsules and the same independent testing as the 3-month pack, so the only real decision is how much to commit to up front.
3Best with added nutrients
Codeage Liposomal C15:0 with CoQ10 and Astaxanthin
Combines C15:0 with CoQ10 and astaxanthin in one vegan capsule.
- Dose
- 150 mg C15:0 per capsule
- Extras
- 150 mg CoQ10, 10 mg astaxanthin
- Supply
- 30 servings
Prices and availability on Amazon change often.
Pros
- Higher C15:0 dose per capsule
- Vegan and free from dairy, soy and gluten
- Made in the USA
Cons
- Combination makes it hard to tell which ingredient does what
Why we like it
Codeage gives 150 mg of C15:0 per capsule, more than Fatty15, along with CoQ10 and astaxanthin. It is vegan and avoids the common allergens, and it is made in the USA. The combination is useful if you want all three ingredients together, though it is harder to judge the C15:0 part alone.
4Best budget high dose
Lithorvexalyn Pentadecanoic Acid C15:0, 120 Tablets
A high-dose C15:0 tablet at a lower price.
- Dose
- 800 mg C15:0 per tablet
- Count
- 120 tablets
Prices and availability on Amazon change often.
Pros
- High dose per tablet
- Gluten-free, no artificial additives
- Lower price
Cons
- Dosing is left to the user, with no fixed amount on the label
Why we like it
Lithorvexalyn gives 800 mg of C15:0 per tablet, much more than the other picks, at a lower price. It is gluten-free and free from artificial additives. The catch is that the label does not prescribe a dose, so check with a healthcare professional before taking it.
5Best budget single bottle
Samareniq Pentadecanoic Acid Supplement, 1 Pack
A low-cost, once-daily capsule with third-party testing.
- Dose
- 300 mg C15:0 per capsule
- Supply
- 1 pack
Prices and availability on Amazon change often.
Pros
- Lowest price in the set
- Third-party tested
- Individually sealed for freshness
Cons
- Single bottle is a short supply
Why we like it
Samareniq is the cheapest option here, with 300 mg of C15:0 per capsule taken once a day. It is third-party tested and made in the USA, and the blister packs suit travel. It is a good low-risk way to try C15:0 before committing to a larger supply.
FAQ
Who it's for?
C15:0 supplements suit people who avoid dairy, since the fatty acid is mainly found in whole-fat dairy. They are a poor fit if you are looking for proven health results, because the independent research is still limited.
What to look for?
- A clearly stated dose of C15:0 per capsule or tablet.
- Independent third-party testing.
- Claims that match the available evidence rather than promising to reverse aging.
What should you skip?
Skip products that promise to cure or reverse disease. Be wary of supplements whose evidence comes mainly from the company's own studies. Speak with a doctor before taking C15:0, especially if you are pregnant, nursing or on medication.
Which foods contain C15:0 fatty acid?
C15:0 is found mainly in whole-fat dairy such as milk, butter and cheese, plus ruminant meats like beef and lamb, and some fish and plants. Dairy is the most common food source.
What are the benefits of C15:0?
Most research on C15:0 is early. The clearest independent evidence is for cardiovascular benefits when it comes from dairy, while claims for slowing aging or treating conditions are not supported by clinical trials.
Is C15 fatty acid better than omega-3?
There is no evidence that C15:0 is better than omega-3. Some marketing claims compare them, but independent reviewers note the research is limited and the two are not interchangeable.
How much C15 is recommended per day?
No official daily amount exists, because C15:0 is not established as an essential nutrient. Products vary from 100 mg to 800 mg per serving, so follow the label and check with a healthcare professional.
Which C15:0 supplement is the best?
The best choice depends on your goal. Fatty15 has the clearest dose and independent testing, Codeage adds CoQ10 and astaxanthin, and Samareniq is the lowest-cost option.
What are people saying about Fatty15 in their reviews and complaints?
Reviewers praise the lack of smell, taste or side effects and the independent testing. Critics, including CSPI and ConsumerLab, say the price is high and the health claims are not backed by clinical trials.
Why trust BullseyeBuy
How we made this guide
- 10 products compared
- 4 expert reviews read
- 10 Amazon listings checked
This shortlist is built from the Amazon listings of each product, checked for stock and price, with the claims weighed against independent expert reviews and manufacturer data. Most of the research on C15:0 is still early, so we favor products with clear labels and honest claims.
Our expert team tests products when it is needed and researches online and in interviews. Every guide is fact-checked and edited by a real person.
The BullseyeBuy editorial team · Updated Oct 18, 2026
Checking our work: 2 sources
How we pickEditorial standardsAffiliate disclosureReport a mistake
We earn a commission when you buy through our links, at no extra cost to you. It never decides the winner.
