fatty15 is priced like an established supplement for a still-emerging idea. Before you subscribe, here’s every price on fatty15.com, checked July 17, 2026, converted to cost per day and per year.
Every price tier, in one table
| Option | Price | Per day | Per year (equiv.) |
|---|---|---|---|
| 90-day starter kit | $119.95 | ~$1.33 | ~$485 |
| Annual kit | $459.95 | ~$1.28 | ~$460 |
| 30-day trial subscription | $49.95 | ~$1.66 | ~$605 |
| At-home C15:0 blood test (optional) | $199 | — | one-time add-on |
The $199 test deserves its own paragraph
The optional blood test, run through Genova Diagnostics, measures your C15:0 “level” against a deficiency framework that mainstream nutrition science does not recognize — the National Academies do not classify C15:0 as essential. In other words, it sells the diagnosis that justifies the product. The Center for Science in the Public Interest reviewed the category and concluded bluntly: “Save your money.” If you’re curious about C15:0, whole dairy fat and some fish supply it in food at no marginal cost while the evidence matures.
The annual bill
Frequently asked questions
How much does fatty15 cost?
Checked July 17, 2026: $119.95 for the 90-day kit (~$1.33/day), $459.95 annual (~$1.28/day), or $49.95 for a 30-day trial ($1.66/day). An optional C15:0 blood test is $199.
Is the $199 blood test worth it?
It measures a “deficiency” the broader nutrition field doesn’t recognize, then sells the fix. CSPI’s verdict on the category was “Save your money.” We’d skip it.
Is fatty15 worth the money?
The product is transparent and well-made, but its benefit is unconfirmed in independent human trials as of 2026. You’re paying for an early hypothesis. See our review.
Can I get C15:0 from food instead?
Yes — it occurs in whole dairy fat and some fish. That’s the no-cost route while the science matures.
Sources
- fatty15 — fatty15.com product page (90-day kit $119.95, annual $459.95, 30-day trial $49.95; $199 Genova C15:0 blood test; Seraphina Therapeutics). Checked July 17, 2026.
- Center for Science in the Public Interest — “Is Fatty15 worth the hype?” (essentiality not recognized; company-linked trials; “Save your money”). Accessed July 17, 2026.
- The Ingredient Report — fatty15 review (48/100).
Update history
- July 17, 2026 — Page first published. Facts checked this date. Next check: August 2026.
Content is for informational purposes only and is not medical or financial advice. Medical disclaimer.