fatty15 – 90 day Starter Kit – C15:0 Pentadecanoic Acid
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Fatty acid supplement: Pentadecanoic acid (C15:0) in pure, vegan-friendly form. fatty15 capsules contain >99.5% pure C15:0, an odd-chain saturated fatty acid. Free fatty acid form that your body can absorb directly.
Kits contains 3 months supply – 3 bottles. Further reading: The Longevity Nutrient book.
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What is fatty15 and who is it for?
fatty15 contains pentadecanoic acid (C15:0), an odd-chain saturated fatty acid that researchers have identified as the third essential fatty acid (after omega-3 and omega-6). This is vegan-synthesized C15:0 in free fatty acid form, delivered in small capsules without the calories, even-chain saturated fats, or digestive complexity of whole-fat dairy (the primary dietary source). You might consider this if you’re over 30 and focusing on cellular resilience as part of a longevity-oriented health strategy.
This makes sense over dietary sources if you want C15:0 without the 16-carbon saturated fats and calories that come with whole-fat dairy, or if you follow a plant-based diet. The free fatty acid form means it’s immediately bioavailable rather than bound up in triglycerides that require digestion.
Fairfield Nutrition Thoughts
C15:0 is an odd-chain saturated fatty acid that appears to play distinct roles in cellular membrane integrity and metabolic signaling, separate from the omega fatty acids we’ve focused on for years.
The research is compelling, particularly the cell-based work showing C15:0’s role in membrane stabilization and PPAR activation. Human outcome data is still emerging, but the mechanistic studies are strong enough that many longevity-focused practitioners have added this to their protocols.
Why This Formulation / How It Works
fatty15 provides C15:0 as a free fatty acid rather than bound in triglycerides (as it exists in food). This matters because free fatty acids can be absorbed directly through intestinal cells without requiring pancreatic lipase digestion. The capsules contain >99.5% pure pentadecanoic acid with minimal excipients. Most dietary C15:0 comes from whole-fat dairy, but dairy fat is predominantly C16:0 (palmitic acid, an even-chain saturated fat linked to inflammation) with only trace amounts of C15:0. Getting therapeutic amounts of C15:0 from dairy would require consuming significant calories and pro-inflammatory fats. The vegan synthesis used here provides isolated C15:0 without those concerns.
Role in Cell Membrane Structure
C15:0 incorporates into cell membrane phospholipids, where its odd-chain structure (15 carbons vs. the typical 16 or 18) creates different packing geometry in the lipid bilayer. Research shows this strengthens membranes against lipid peroxidation, the oxidative damage that accumulates with age. Unlike polyunsaturated fatty acids (which have multiple double bonds vulnerable to oxidation), C15:0 is a saturated fat that provides structural stability.
PPAR Receptor Activation
C15:0 functions as a PPAR-α/δ agonist, meaning it binds to and activates these nuclear receptors. PPARs regulate genes involved in fatty acid metabolism, glucose handling, and inflammatory responses. PPAR-α activation is particularly relevant to hepatic fatty acid oxidation and lipid metabolism, while PPAR-δ affects cellular energy utilization and mitochondrial function.
AMPK Pathway Involvement
Cell studies show C15:0 activates AMPK (AMP-activated protein kinase), a cellular energy sensor that promotes glucose uptake and fatty acid oxidation when activated. AMPK activation is one mechanism through which cells respond to energy demands and maintain metabolic homeostasis.
When to Consider This
This optimization-focused supplement makes sense if you’re:
- Over 40 and prioritizing cellular resilience and longevity-focused nutrition
- Following a low-dairy or plant-based diet and want to address potential C15:0 insufficiency
- Working with a practitioner on metabolic wellness and have established foundational nutrition
Important: Best used once foundational health is stable and major health goals have been addressed. This is an optimization compound, not a corrective intervention.
⚠️ Not suitable for: Children under 4 years, individuals with known hypersensitivity to pentadecanoic acid
How to Use
Take 1 capsule daily. Can be taken with food or on an empty stomach. Some people take 2 capsules daily, though manufacturer recommends starting with 1 capsule to assess individual response.
Each capsule contains 100mg of pure pentadecanoic acid (C15:0). The free fatty acid form allows for direct absorption without requiring digestive breakdown.
Ingredients
Per capsule:
Pentadecanoic acid (C15:0): 100mg (as free fatty acid, >99.5% pure, vegan-synthesized)
Other ingredients: Vegetarian capsule (hydroxypropyl methylcellulose), microcrystalline cellulose, rice flour, silicon dioxide
Allergen information: Free from common allergens. Vegan-friendly formulation.
Common Questions
How is this different from just eating full-fat dairy?
Whole-fat dairy contains mostly C16:0 (palmitic acid, an even-chain saturated fat) with only trace C15:0. To get 100mg of C15:0 from dairy, you’d need to consume significant amounts of C16:0 and calories. This provides isolated C15:0 without those concerns.
What’s the evidence for C15:0 as an essential fatty acid?
Population studies show higher C15:0 levels correlate with better metabolic markers. Cell-based research demonstrates it has distinct biological activities (membrane stabilization, PPAR activation, AMPK signaling) that can’t be replicated by other fatty acids. The “essential” designation is based on meeting specific criteria: it’s needed for health, can’t be synthesized by the body in adequate amounts, and deficiency causes measurable problems. While the research is compelling, the essential fatty acid classification is still being debated in nutrition science.
When should I expect to notice anything?
This is a nutritional compound that works at the cellular level, not a symptomatic treatment. According to manufacturer surveys, most people who report subjective benefits (sleep, energy, mood) notice changes within 12-16 weeks. Objective markers (metabolic panels, inflammatory markers) would typically be assessed at 3-6 months.
Can I take this with omega-3 supplements?
Yes. C15:0 and omega-3s have complementary roles in cell membranes. Omega-3s provide membrane fluidity while C15:0 provides structural stability. They’re addressing different aspects of cellular health.
Warnings & Storage
Do not use if: Pregnant or breastfeeding (insufficient safety data), under 4 years of age
Cautions: If you have a metabolic disorder affecting fatty acid metabolism, consult your healthcare provider before use. No known medication interactions, but inform your doctor if taking lipid-modifying medications.
Storage: Store in a cool, dry place away from direct sunlight.
Always consult your healthcare professional before use if you have any pre-existing conditions or are taking medications.
| Weight | .315 kg |
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