Fatty15 made C15 (pentadecanoic acid) a household supplement name, and it sits at the top of the price range. If you want to try C15 without paying the premium, there are cheaper capsules, but the savings are only real if you compare the amount of C15 you actually get. This guide does that arithmetic for the products we feature, using prices and doses printed on each product page when we checked them on October 15, 2026.
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Prices on Amazon and brand sites change often, sometimes daily, so check the live price before you buy. The method matters more than any single figure.
Key Takeaways
- Compare cost per 100 mg of C15, not cost per bottle. On October 15, 2026 the cheapest products we checked cost a fraction as much per 100 mg as Fatty15 capsules.
- The cheaper capsules are 300 mg each, three times a Fatty15 capsule. A cheaper daily cost does not mean a studied dose: the one randomized trial of C15 alone used 200 mg a day.
- We could not find a published certificate of analysis for any product here, Fatty15 included. Every testing claim we found was a sentence on the listing.
- Two featured products are blends that do not state how much C15 they contain, so their value cannot be calculated.
Cost Per 100 mg of C15: The Comparison
Here is how each product ranks on cost per 100 mg of C15, from the listings as read in October 2026. We used the one-time price unless a subscription row is shown. Prices change, so check the current listing.
| Product | C15 per unit (as listed) | Cost per 100 mg C15 |
|---|---|---|
| Samareniq C15:0 (36 capsules) | 300 mg | lowest |
| Nokvba C15:0 (45 capsules) | 300 mg | near the lowest |
| Fatty15 capsules, one-time (90) | 100 mg | high |
| Fatty15 capsules, subscription (90, fatty15.com) | 100 mg | below the one-time kit |
| Fatty15 gummies (60) | 50 mg (from the listing’s 2 gummies = 100 mg) | highest |
| Lithorvexalyn tablets (120) | 800 mg claimed, not verified | not reliable |
| DTORUNI liposomal blend (90) | not stated | cannot calculate |
| StayWell C15:0 Cellular Complex (120) | not stated | cannot calculate |
Prices and doses as printed on Amazon product pages and fatty15.com on October 15, 2026. C15 per unit is the amount stated in each listing’s text; we did not verify it against a lab test.
Two things stand out. First, the 300 mg sheep-milk capsules cost a fraction as much per milligram as Fatty15. Second, the daily cost comparison depends on dose. One Samareniq capsule delivers 300 mg for about half the daily cost of one 100 mg Fatty15 capsule. If you only want 100 mg a day, no product here sells a 100 mg generic capsule, so the cheaper option means taking more C15, not the same amount for less. The only randomized trial of C15 on its own used 200 mg a day for 12 weeks and reported no significant adverse events.[1] There is no trial data at 300 mg a day.
Fatty15’s own site showed slightly different subscription figures on different pages, so confirm the checkout total before subscribing.
Our Picks, and What Each One Trades Off
Lowest Cost Per Milligram: Samareniq
Per 100 mg, Samareniq was the cheapest product with a clearly stated C15 dose: 300 mg per capsule, 36 capsules in a blister pack, sourced from “high-altitude grass-fed sheep milk” according to the listing. The listing says it is independently third-party tested but does not link a certificate.
Research note: Odd-chain fatty acids make up only about 1% (C15:0) and 0.5% (C17:0) of total milk fatty acids [10].
Close Second: Nokvba
Nokvba lists the same 300 mg sheep-milk format in a 45-capsule bottle at nearly the same cost per 100 mg, and sells larger bottles too. It also claims third-party testing without a linked certificate. The near-identical wording across these sheep-milk listings suggests a shared contract manufacturer, which is common in supplements and not a problem in itself, but it means the brand name tells you little.
Most Traceable: Fatty15
Fatty15 costs the most per milligram. What the premium buys is a company you can identify: a brand website, a named research team behind the original C15 work, and a product made in the dose used in its own marketing. It does not buy a different molecule. Fatty15’s page says every batch is independently tested, but like the others it does not publish the certificate. It is also worth knowing that the company funds much of the C15 literature it cites. Our full Fatty15 review covers whether it is worth the price.
Read Carefully: Lithorvexalyn, DTORUNI and StayWell
Lithorvexalyn’s listing claims 800 mg of C15 per tablet, 120 tablets to a bottle. If that were accurate it would be by far the cheapest C15 per milligram, which is exactly why we have not put a number on it: the claim is out of line with every other product, the listing gives no daily dose, and we could not verify the amount. DTORUNI and StayWell are blends with CoQ10, L-carnitine and other ingredients and do not state how much C15 is in a capsule, so they cannot be compared on value at all.
What to Check on Any C15 Label
- C15 in milligrams, per unit. “300 mg capsule” can mean the whole capsule. You want pentadecanoic acid listed with its own amount, not a blend total.
- Single ingredient or blend. Blends make the C15 dose impossible to compare and add ingredients you may not want.
- A certificate of analysis you can actually open. A sentence saying “third-party tested” is a claim, not evidence. Ask the seller for the certificate for your batch.
- A company behind the listing. A brand website and contact details make recalls and complaints traceable.
- Dose against the evidence. More milligrams is not automatically better. The human trial data covers 200 mg a day for 12 weeks.[1]
- Do the math. Price divided by (units times mg per unit), times 100, gives cost per 100 mg. Bigger bottles are not always cheaper per milligram.
Why Testing Matters More Than the Brand Name
In the United States, supplements are not approved for quality before they are sold; the FDA generally acts after harm is reported. A 2020 review lists microbial and heavy metal contamination, hidden drugs and mislabeled ingredients among documented problems and advises using products tested by outside laboratories.[2]
Label accuracy is a real issue in loosely regulated categories. When researchers tested hemp supplements made for pets, most were outside 10% of their labeled cannabinoid content, though most sellers could provide a certificate of analysis on request.[3] Heavy metal results vary by category. Testing of natural health products found contamination in many, with levels above established limits in a small share.[4] A 2025 analysis found most of the adaptogen herbal supplements it tested failed safety criteria, mainly for lead and nickel.[5] Yet the protein powders tested in Hungary were all within limits, and the authors still recommended routine heavy-metal testing.[6]
None of these studies tested a C15 product. They show why a certificate you can read is worth more than a brand story, whichever product you choose.
Can You Get C15 From Food Instead?
C15 is present in small amounts in milk fat and ruminant meat, and the body can also make some from propionate produced by gut bacteria.[7] USDA’s FoodData Central lists 15:0 content for many dairy foods.[8] Food is a reasonable baseline, but reaching a specific daily amount through diet alone is hard to measure. See our guide to C15 food sources for the details.
It is also hard to compare food with a capsule. In a 4-week feeding trial in 124 healthy adults, daily dairy servings raised plasma 15:0 only slightly (0.26 v. 0.22% of total fatty acids), so extra dairy does not behave like a dose [9].
Frequently Asked Questions
Is there a cheaper alternative to Fatty15?
Yes. On October 15, 2026, 300 mg sheep-milk C15 capsules cost a fraction as much per 100 mg as Fatty15 capsules. Each capsule contains three times as much C15, so compare the dose as well as the price.
Are Fatty15 dupes the same as Fatty15?
They sell the same molecule, pentadecanoic acid. What differs is the dose per capsule, whether the amount is verified, and whether there is a company you can trace. None of the products we checked, Fatty15 included, publishes a certificate of analysis.
Is a higher-dose C15 capsule better?
Not necessarily. The only randomized trial of C15 on its own used 200 mg a day for 12 weeks. There is no trial data on higher daily amounts.
Why can’t you calculate value for some products?
Some listings are blends that give a total capsule weight but not how much of it is C15. Without that number, cost per milligram of C15 cannot be worked out.
This page is for information only and is not medical advice. If you are pregnant, nursing, managing a health condition or taking medication, talk to a clinician before starting any supplement. Our Fatty15 side effects and safety guide covers what is known about tolerability.
References
- Robinson MK et al. Pentadecanoic Acid Supplementation in Young Adults with Overweight and Obesity: A Randomized Controlled Trial. Journal of Nutrition (2024). PMID 39069269
- White CM. Dietary Supplements Pose Real Dangers to Patients. Annals of Pharmacotherapy (2020). PMID 31973570
- Wakshlag JJ et al. Cannabinoid, Terpene, and Heavy Metal Analysis of 29 Over-the-Counter Commercial Veterinary Hemp Supplements. Veterinary Medicine: Research and Reports (2020). PMID 32346530
- Genuis SJ et al. Toxic element contamination of natural health products and pharmaceutical preparations. PLoS One (2012). PMID 23185404
- Jasińska-Balwierz A et al. Heavy Metal Contamination in Adaptogenic Herbal Dietary Supplements: Experimental, Assessment and Regulatory Safety Perspectives. Biology (2025). PMID 41300272
- Horváth IL et al. Analysis of heavy metal content in protein powders available on the Hungarian market: a reassuring snapshot, but not a reassuring quality guarantee. Journal of Nutritional Science (2025). PMID 40703701
- Pfeuffer M, Jaudszus A. Pentadecanoic and Heptadecanoic Acids: Multifaceted Odd-Chain Fatty Acids. Advances in Nutrition (2016). PMID 27422507
- FoodData Central. U.S. Department of Agriculture, Agricultural Research Service. Fatty acid profiles of foods, including 15:0. fdc.nal.usda.gov
- Mohammad M. H. Abdullah et al. Recommended dairy product intake modulates circulating fatty acid profile in healthy adults: a multi-centre cross-over study. British Journal Of Nutrition (2015). PMID 25609231
- Sellem L et al. Can individual fatty acids be used as functional biomarkers of dairy fat consumption in relation to cardiometabolic health? A narrative review. The British journal of nutrition (2022). PMID 35086579
Related: Fatty15 Review · Best C15 Supplements Ranked · How Much Does Fatty15 Cost?
These statements have not been evaluated by the Food and Drug Administration. This information is not intended to diagnose, treat, cure, or prevent any disease. Content is for informational purposes only and is not medical advice; consult a qualified healthcare provider before starting any supplement. As an Amazon Associate we earn from qualifying purchases.