Ozzi vs Fatty15 (C15:0): An Honest 2026 Comparison
If you've been down the longevity rabbit hole, you've seen Fatty15. Little blue pill, one ingredient, promises to fix your cells from the inside.
And if you've been fighting night cravings, you've probably seen Ozzi. Watermelon stick, mix it in water, aimed squarely at the 9pm snack run.
People keep asking me which one they should buy. Fair question. They get lumped together because both are "natural" and both touch metabolic health. But they're built for two completely different jobs.
Here's the honest breakdown, from the guy who makes one of them.
Fatty15 is a single-ingredient C15:0 fatty acid supplement built for long-term cellular and metabolic health, not appetite. Ozzi is a 6-ingredient GLP-1 boosting drink stick built to curb cravings and food noise. If your goal is quieting night cravings now, Ozzi fits better. If it's slow cellular support, Fatty15 fits.
Key takeaways
- Fatty15 is one ingredient: 100mg C15:0 pentadecanoic acid.
- Ozzi is 6 craving-focused ingredients in a drink stick.
- C15:0 targets long-term cell and liver health, not appetite.
- Ozzi targets night cravings and food noise directly.
- They solve different problems, so compare goals first.
What is Fatty15 (C15:0)?
Fatty15 is a supplement with one active ingredient: pentadecanoic acid, an odd-chain saturated fat also written as C15:0.
You find small amounts of C15:0 in whole dairy fat and some fish. The company behind Fatty15 (Seraphina Therapeutics) argues most people don't get enough of it, and that topping it up supports cell membranes, mitochondria, and metabolic markers.
The dose is 100mg once a day in a small softgel. The pitch is longevity and "cellular health," not weight loss and not cravings.
The mechanism story is interesting. C15:0 acts as a dual PPAR alpha/delta agonist, meaning it nudges the same nuclear receptors that help regulate fat metabolism and inflammation. That's a real, plausible pathway. Whether a 100mg pill moves the needle for you is the harder question.
What is Ozzi Crave Crusher?
Ozzi is a GLP-1 boosting drink stick. You tear open a watermelon-flavored stick, drop it in 16oz of cold water, and drink it. Zero caffeine, so you can have it at night.
It's built around one job: quieting cravings and food noise. Especially the kind that shows up after dinner, when you've eaten clean all day and the night monster still wants cookies.
The formula runs 6 active ingredients instead of one:
- Allulose (8.35g), a rare sugar that satisfies sweet cravings without spiking blood sugar like regular sugar.
- Glucomannan konjac fiber (0.556g), a soluble fiber that expands in the stomach for physical fullness.
- L-Lysine Butyrate (0.537g), a butyrate form tied to GLP-1 release from gut L-cells.
- Chicory root inulin (0.5g), a prebiotic that feeds bacteria which make more butyrate.
- Highly branched cyclic dextrin (0.5g) for steady energy without a spike.
- African mango and chromium for satiety signaling and blood sugar support.
For the full mechanism, I wrote a deeper piece on butyrate and GLP-1 and another on how to stop food noise naturally.
One is a longevity pill you take and forget. The other is a drink you reach for the moment cravings hit.
How do Ozzi and Fatty15 compare head to head?
Here's the side-by-side. Notice the goal column, because that's the whole story.
| Feature | Ozzi Crave Crusher | Fatty15 (C15:0) |
|---|---|---|
| Main goal | Curb cravings and food noise | Long-term cellular and metabolic health |
| Active ingredients | 6 (allulose, konjac, butyrate, inulin, African mango, chromium) | 1 (C15:0 pentadecanoic acid) |
| Format | Watermelon drink stick in water | Once-daily softgel |
| Appetite effect | Direct, that's the design | Not a stated target |
| GLP-1 angle | Butyrate + prebiotic fiber pathway | PPAR receptor pathway, not GLP-1 |
| How fast you notice | Often within days on cravings | Weeks to months, marker-based |
| Rough cost | Similar monthly range | About $40/month on subscription |
The takeaway isn't that one beats the other. It's that they barely overlap. If someone tells you Fatty15 will stop your 10pm snacking, they're stretching. That's not what it was built to do.
Does C15:0 actually help with weight or cravings?
Short answer: the evidence points at metabolic markers, not appetite.
The headline study is a 12-week randomized controlled trial published in The Journal of Nutrition in 2024. Young adults with overweight or obesity took 200mg of C15:0 or placebo daily.
The clearest result was a drop in GGT, a liver enzyme, by about 11 U/L versus placebo, adjusted for weight change. That's a liver and metabolic signal. It is not a weight loss or appetite result.
A smaller trial of healthy adults on 100mg found no significant differences in body weight, waist size, cholesterol, or blood sugar versus placebo. So dose and population matter, and the appetite story just isn't there yet.
Higher circulating C15:0 does correlate with better long-term outcomes, lower type 2 diabetes and cardiovascular risk in large observational data. Correlation, though, not a "this pill made you eat less" finding.
C15:0's best evidence is a liver enzyme moving, not a craving disappearing. Judge it on what it's actually for.
None of that makes Fatty15 a bad product. It just makes it the wrong tool if your real problem is that you're eating everything after 7pm.
How does Ozzi target appetite and food noise?
Ozzi comes at cravings from a few directions at once, which is the point of a 6-ingredient stack.
The GLP-1 angle runs through butyrate. Short-chain fatty acids like butyrate can trigger GLP-1 release from gut L-cells by hitting the FFAR2 receptor. GLP-1 is the same satiety hormone that Ozempic mimics, so boosting your own is the natural-side play.
Then there's the physical side. Glucomannan konjac fiber soaks up water and expands, so your stomach feels fuller. Allulose gives you sweet taste to answer a sugar craving without the blood sugar spike of real sugar. I covered that in detail in does allulose spike blood sugar.
The inulin feeds gut bacteria that make even more butyrate, which loops back into the GLP-1 pathway. If gut mechanics are your thing, here's gut health and GLP-1.
To be clear on the rules: these are structure/function supports, not a promise to treat any disease. Ozzi helps you feel fuller and quiet cravings. It's not a drug.
Which one is better for nighttime cravings?
For night cravings specifically, Ozzi. And I'd say that even if I didn't make it.
Nearly half the people who buy Ozzi tell us their number one problem is after-dinner snacking. "Stellar all day, then the monster comes out at night." A once-daily longevity pill doesn't meet you in that 9pm moment.
Ozzi does. It's a drink you physically reach for when the urge hits, caffeine-free so it won't wreck your sleep. The ritual itself helps: you're doing something instead of opening the cabinet.
Fatty15 is a background investment in your cells. Ozzi is a front-line tool for a craving you're having right now. If you want a broader look, here's my best natural appetite suppressant guide and the natural GLP-1 booster breakdown.
Can you take Ozzi and Fatty15 together?
Probably, and honestly they'd complement each other since they don't overlap.
Fatty15 would run in the background for cellular and liver support. Ozzi would handle the day-to-day cravings. No shared ingredients, no obvious conflict.
That said, I'm not your doctor. If you take medication or have a health condition, run any stack past a professional first. The safe move is always to start one product at a time so you know what's doing what.
Who should choose which?
Simple way to decide it.
Choose Fatty15 if: your goal is long-game longevity, you care about liver and metabolic markers, and you want a simple one-pill routine. Cravings aren't your main issue.
Choose Ozzi if: you eat clean all day and lose it at night, you want a natural way to boost GLP-1 and quiet food noise, and you'd actually enjoy a caffeine-free drink over swallowing a pill.
If you came here because of night cravings, that's your answer. If you came here because of a longevity podcast, that's a different answer.
Frequently asked questions
Is Fatty15 the same as fish oil or omega-3?
No. Omega-3s are long-chain polyunsaturated fats. C15:0 is an odd-chain saturated fat with a different mechanism, acting on PPAR receptors.
Does Fatty15 suppress appetite?
It isn't marketed for appetite, and the clinical trials measured metabolic markers, not hunger. Don't buy it expecting craving control.
Does Ozzi contain C15:0?
No. Ozzi uses a different set of ingredients focused on cravings: allulose, konjac fiber, butyrate, inulin, African mango, and chromium.
Is Ozzi a GLP-1 drug like Ozempic?
No. Ozzi is a drink stick that supports your body's own GLP-1 through the butyrate pathway. No injections, no prescription.
Which works faster?
People usually notice Ozzi on cravings within days. C15:0 benefits are slow and marker-based, measured over weeks or months.
Are they both natural and vegan?
Fatty15's C15:0 is vegan-friendly. Ozzi is vegan-friendly too, with no caffeine and no artificial sweeteners.
Can I take Ozzi at night?
Yes. It's caffeine-free by design, so it fits an evening routine when cravings tend to peak.
Do either of them replace Ozempic?
Neither is a prescription GLP-1 drug. Ozzi is a natural GLP-1 booster for people who want that direction without the shot. Fatty15 is a longevity supplement, unrelated to that goal.
What if Ozzi doesn't work for me?
First bags come with a 14-day challenge. Use it 14 days straight, and if it doesn't work for you, we refund your first bag.
If cravings are the problem, start with the tool built for cravings
Ozzi is a caffeine-free watermelon drink stick that helps quiet food noise and curb night cravings, naturally. First bags come with our 14-day challenge: use it 14 days straight, and if it doesn't work for you, we refund your first bag.
- Venn-Watson S, et al. Pentadecanoic Acid Supplementation in Young Adults with Overweight and Obesity: A Randomized Controlled Trial. The Journal of Nutrition. 2024. https://pmc.ncbi.nlm.nih.gov/articles/PMC12612588/
- C15:0 Supplementation in Young Adults at Risk for Metabolic Syndrome (NCT04947176). ClinicalTrials.gov. https://clinicaltrials.gov/study/NCT04947176
- Tolhurst G, et al. Short-chain fatty acids stimulate glucagon-like peptide-1 secretion via the G-protein-coupled receptor FFAR2. Diabetes. 2012. https://pubmed.ncbi.nlm.nih.gov/22190648/
- Psichas A, et al. The short chain fatty acid propionate stimulates GLP-1 and PYY secretion via free fatty acid receptor 2 in rodents. Int J Obes. 2015. https://pmc.ncbi.nlm.nih.gov/articles/PMC4356745/
- Christiansen CB, et al. The impact of short-chain fatty acids on GLP-1 and PYY secretion from the isolated perfused rat colon. Am J Physiol Gastrointest Liver Physiol. 2018. https://journals.physiology.org/doi/abs/10.1152/ajpgi.00346.2017
- Müller M, et al. Circulating but not faecal short-chain fatty acids are related to insulin sensitivity, lipolysis and GLP-1 concentrations in humans. Sci Rep. 2019. https://www.nature.com/articles/s41598-019-48775-0
These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease. Ozzi is a dietary supplement, not a substitute for medical advice. Talk to your doctor before starting any new supplement.