How long until I notice a difference?

The brand says 70% of customers report benefits within 16 weeks. Sleep and energy changes are the most commonly reported, so plan on at least a few weeks.

How do I take Fatty15?

Take one capsule daily, or up to two. Each capsule has 100 mg of C15:0, and the kit's three bottles cover 90 days at one a day.

Is it vegan and allergen-free?

Yes. It is vegan, dairy-free and gluten-free, with only FA15 (pentadecanoic acid) and a vegetable cellulose capsule.

What happens after the starter kit?

Refills ship every 90 days by subscription at $119.95. Check the terms before ordering if you don't want recurring charges.

Is it safe for children?

The brand says it is GRAS certified and safe for ages 4 and up, but not for infants and toddlers.

When is the price lowest?

The best new price found was $36.05 at eBay as of November 8, 2026, against $119.95 for a brand refill. Prices vary by store, so compare before buying.

Where is the Fatty15 Starter Kit cheapest?

At eBay, for $36.05, 76% under what the other stores charge, as of our latest check.

What do buyers say about the Fatty15 Starter Kit?

Rated 4.8 out of 5 from 8,756 ratings. Buyers like: Deeper, sounder sleep and falling asleep easier; More energy and no afternoon crash; Calmer mood and less stress.

Where can I buy the Fatty15 Starter Kit?

11 stores we checked sell it, including Lionheart Longevity, Amazon, eBay, fatty15, Supplement Hub UK.

Fatty15 Starter Kit

Best price now

$36.05at eBayObserved at 3:13 PM

76% under what the other stores charge

Compared across 12 stores. Prices are checked against each store and labelled with when. Store links may earn us a commission.

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Our take on the Fatty15 Starter Kit

Fatty15 is a daily capsule supplement built around C15:0 (pentadecanoic acid), a saturated fatty acid the brand says strengthens cell membranes and supports metabolic, cognitive, immune, liver and red blood cell health. The Starter Kit holds three bottles of 30 capsules, a 90-day supply at 100 mg per capsule, and the pills are small with no smell or taste. It is vegan, dairy-free and gluten-free. The best new price found is $36.05 at eBay as of November 8, 2026, well below the $119.95 the brand charges for each 90-day subscription refill.

What reviewers say

4.8 / 58,756 ratings

With 4.8 out of 5 from 8,756 ratings, buyers mostly report better sleep, steadier energy and a calmer mood, often after several weeks of use. Some also mention improved blood work and skin. The main caveat is that results take time and not everyone notices a change.

What people mention

SleepPraisedBuyers commonly report falling asleep faster and sleeping more deeply.
EnergyPraisedMany say they have steadier energy and no afternoon crash.
MoodPraisedSome describe a calmer mood and less stress.
Pill sizePraisedThe capsules are described as tiny with no smell or taste.
Time to resultsMixedBenefits are said to arrive over weeks to months, and some users notice nothing.

About the Fatty15 Starter Kit

Fatty15 is a science-backed, patented and award-winning supplement containing pure C15:0 - a crucial fatty acid that strengthens our cell membranes against lipid peroxidation and slows aging at the cellular level. The result? Staying healthier, longer.*Fatty15 has key activities that support*:

Metabolic health

Cognitive health

Immune response

Liver health

Red blood cell health

70% of customers report seeing and feeling benefits within 16 weeks, including deeper sleep, calmer mood, improved energy, and overall improved health.†*

Note: After your initial kit, all subscription refills will ship every 90 days at $119.95.