fatty15 Review

Best for: single-ingredient C15:0 longevity supplement

fatty15 is a daily C15:0 (pentadecanoic acid) supplement marketed for cellular longevity, metabolic health, and inflammation reduction. C15:0 is an odd-chain saturated fatty acid that the company's published research positions as the first essential fatty acid to be discovered in 90+ years, with claimed effects on cell membrane stability and mitochondrial function.

6.7
★★★☆☆3.4
C15:0LongevityCellular HealthInflammation
$50/mo
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The Bottom Line

fatty15 is a solid telehealth option with balanced features and pricing.

Score: 6.7/10Best for: single-ingredient C15:0 longevity supplementFrom: $50/mo

Score Breakdown

Value
6
Effectiveness
6
User Experience
7.5
Trust & Safety
7
Accessibility
8
Support
7

Pricing

DoseFormPrice/mo
Monthly subscription (preliminary)brand$50

✓ Pros

  • •Single-ingredient supplement with a clear mechanism (C15:0 cell-membrane stability) and a published research portfolio behind it
  • •Strong brand-recognition lever — fatty15 has run high-profile longevity-content marketing through 2024-2025
  • •Pure C15:0 is hard to sourcefrom diet alone (mainly found in dairy fat) so supplementation has a defensible nutritional rationale for some patients

✗ Cons

  • •Stub entry — exact pricing, ingredient panel, third-party lab testing, FDA / FTC adverse actions, and the longevity / metabolic claims all need a YMYL verification pass
  • •Confidence is LOW until that pass is done
  • •C15:0 essential-fatty-acid status is the company's own positioning; independent peer-reviewed consensus on whether it should be classified as essential is still developing
  • •Not a weight-loss product per se — listed here because longevity / cellular health overlaps with our metabolic-health editorial scope, not because it directly causes weight loss

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Starting at $50/month. See current pricing and start your free consultation.

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Sources & methodology

Our fatty15 review applies the same 6-dimension scoring framework we use for every provider. Pricing, FDA approval status, compounding rules, and clinical-trial efficacy claims are sourced from the primary regulatory and peer-reviewed literature below.

Sources & methodology — as of April 2026
  1. 1.Weight Loss Rankings — GLP-1 Pricing Index 2026 (our independent dataset)— WeightLossRankings.org.
  2. 2.FDA — Compounding and the 503A Pharmacy Framework— U.S. Food & Drug Administration.
  3. 3.FDA — Drug Shortages Database (current shortage listings)— U.S. Food & Drug Administration.
  4. 4.PCAB — Pharmacy Compounding Accreditation Board Standards— Accreditation Commission for Health Care (ACHC) / PCAB.
  5. 5.KFF — Medicaid coverage research (anti-obesity & GLP-1 drug policy)— Kaiser Family Foundation.

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Frequently Asked Questions

Ready to start with fatty15?

Starting at $50/month. See current pricing and start your free consultation.

Visit fatty15 →