Shop
  • Deals
  • Deal checker
  • Black Friday
  • Buying guides
  • Brands
  • Stores
Travel
  • Flight deals
  • Hotel deals
Company
  • Research
  • Press
  • deal.ai apps
Black Friday 2026
  • Walmart
  • Best Buy
  • Target
  • TVs
  • Laptops
  • Headphones
  • Apple
  • Gaming
  • Vacuums
  • Kitchen
  • Toys
  • Smartwatches
  • Tablets
  • Furniture
  • Mattresses
© Deal.ai Inc.
TermsPrivacy
Deal.ai › Compare

Fatty15 Advanced Formula Extra Strength vs Fatty15 C15:0 Supplement Starter Kit

Both kits are the same fatty15 C15:0 supplement in a 90-day supply; the difference is dose per capsule. The Advanced Formula Extra Strength delivers 150 mg of pentadecanoic acid per capsule, so one capsule matches 1.5 standard capsules, and two reach 300 mg. The Starter Kit uses the 100 mg capsule that carries the 4.8-star rating from over 8,700 owners and the reported sleep, energy and mood benefits. Buy the Starter Kit to begin at the studied dose; step up to Extra Strength if you want a higher dose in fewer pills.

  • Choose the Fatty15 Advanced Formula Extra Strength Starter Kit if you want a higher C15:0 dose per capsule and prefer taking fewer pills to reach 150 to 300 mg a day.
  • Choose the Fatty15 Starter Kit if you want the standard 100 mg capsule with the large base of owner ratings and the option to take one or two capsules daily.

Prices

  • Fatty15 Advanced Formula Extra Strength: $95.00 at fatty15 clinic (last seen Nov 8)
  • Fatty15 C15:0 Supplement Starter Kit: $36.05 at eBay (last seen Nov 8)
  • Difference: the Fatty15 C15:0 Supplement Starter Kit is $58.95 cheaper than the Fatty15 Advanced Formula Extra Strength at the latest prices (Nov 8)
Fatty15
Fatty15 Advanced Formula Extra Strength Starter Kit

Fatty15 Advanced Formula Extra Strength

Fatty15 Advanced Formula Extra Strength Starter Kit

5(2 ratings)
$95.00at fatty15 clinicChecked Nov 8
See all prices and details
Visit fatty15 clinic
Pros
  • Higher dose per capsule, so fewer pills for the same intake
  • Reaches 300 mg with two capsules instead of three
  • Same vegan, dairy-free and gluten-free formula
  • Patented C15:0 with the same cellular claims
Cons
  • Fewer owner ratings than the standard kit
  • Higher dose may not suit people who want to start low
  • No GRAS age guidance stated on the listing
Fatty15
Fatty15 Starter Kit

Fatty15 C15:0 Supplement Starter Kit

Fatty15 Starter Kit

4.8(8,756 ratings)
$36.05at eBayChecked Nov 8
See all prices and details
Visit eBay

Store links may earn us a commission.

Pros
  • 4.8 out of 5 from 8,756 ratings
  • Reported benefits include deeper sleep, calmer mood and more energy
  • Tiny, tasteless capsules that are easy to swallow
  • GRAS certified and stated safe for ages 4 and up
Cons
  • 100 mg per capsule means three pills to reach 300 mg
  • Refill pouches are less sturdy than bottles for travel

What separates them

Fatty15 Advanced Formula Extra StrengthFatty15 C15:0 Supplement Starter Kit
C15:0 per capsule150 mg pentadecanoic acid100 mg pentadecanoic acid
Daily dose range150 to 300 mg from one or two capsules100 to 200 mg from one or two capsules
Capsules per day for 300 mgTwo capsulesThree capsules
Supply length90 days at one capsule daily90 days at one capsule daily
PackagingThree bottles of 30 capsulesGlass bottle plus three refill pouches
Owner ratingsNewer extra-strength formula, fewer ratings4.8 out of 5 from 8,756 ratings
Dietary and certificationVegan, dairy-free, gluten-freeVegan, dairy-free, gluten-free, GRAS certified, safe for ages 4+
Capsule size and tasteSmall capsule, no smell or tasteTiny capsule, no smell or taste

Price history

$149.00$36.05
Nov 8Nov 10
  • Fatty15 Advanced Formula Extra Strength: lowest $36.05 on Nov 8 at eBay; $149.00 on Nov 10.
  • Fatty15 C15:0 Supplement Starter Kit: lowest $36.05 on Nov 8 at eBay; $149.00 on Nov 10.

Prices at every store

Fatty15 Advanced Formula Extra Strength

  • fatty15 clinicNew

    In stockReturn policy

    $95.00Checked Nov 8
    Visit fatty15 clinic
  • Wild & Well: A Wellness EmporiumNew

    In stockReturn policy

    $165.00Checked Nov 8
    Visit Wild & Well: A Wellness Emporium

Also available at

  • Dr. Rogers CentersCheck price at Dr. Rogers Centers
  • AmazonCheck price at Amazon
  • austin-skin-wellness.myshopify.comCheck price at austin-skin-wellness.myshopify.com
All 2 stores and price history →

Fatty15 C15:0 Supplement Starter Kit

  • eBayNew

    In stockSold by vgsny

    $36.05Free shippingChecked Nov 8
    Visit eBay
  • fatty15New

    In stockReturn policy

    $119.95Checked Nov 8
    Visit fatty15
  • Supplement Hub UKNew

    In stockShips from the UK · priced in GBP (£96.24) · duties may applyReturn policy

    $128.82Checked Nov 8
    Visit Supplement Hub UK
  • eBayNew

    Availability unknownSold by acemarina (100% positive, 86 ratings)Returns: Set by the eBay seller; the eBay Money Back Guarantee covers an item that doesn't arrive or isn't as described.

    $104.99Free shippingChecked Nov 8
    Visit eBay

Also available at

  • fatty15Check price at fatty15
  • Dr. Rogers CentersCheck price at Dr. Rogers Centers

Store links may earn us a commission.

All 11 stores and price history →

Specs compared

SpecFatty15 Advanced Formula Extra StrengthFatty15 C15:0 Supplement Starter Kit
Serving size1 capsule1 capsule
Servings per container3 x 30 capsules3 x 30 capsules
Dietary considerationsVegan, dairy-free, gluten-freeVegan, dairy-free, gluten-free
Suggested use1-2 capsules daily1-2 capsules daily
C15:0 per capsule100 mg100 mg
Capsules per bottle30 capsules30 capsules
Bottles per kitthree bottlesthree bottles
Main PurposeReplenishing And Strengthening CellsReplenishing And Strengthening Cells
FormulationCapsuleCapsule
Number Of Pills3030
Pentadecanoic acid per serving100 mg—
Supply length90-day supply—
Show all 19 specsShow fewer specs
SpecFatty15 Advanced Formula Extra StrengthFatty15 C15:0 Supplement Starter Kit
Daily dose1 capsule a day—
Capsule count2 x 30 Capsules—
Pentadecanoic acid per capsule150mg—
Pentadecanoic Acid—100 mg
Supply Duration—90-day supply
Dosage—Take 1 capsule a day
Ingredients—FA15™ (Pentadecanoic Acid), Vegetable Cellulose…

What reviewers say

Fatty15 C15:0 Supplement Starter Kit

  • 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.

Questions and answers

Which is better for someone new to C15:0?
Start with the Starter Kit. Its 100 mg capsule lets you begin at one a day and move to two, and it has the largest body of owner feedback.
Is the Extra Strength worth stepping up to?
Yes if you want 300 mg a day from two capsules instead of three, or want a higher dose in a single pill. The formula and the 90-day supply are otherwise the same.
Do they last the same length of time?
Yes. Both are a 90-day supply at one capsule daily, and both allow up to two capsules a day, which shortens the supply to 45 days.
Which has more evidence behind it?
The C15:0 ingredient is the same in both. The Starter Kit has the larger record of owner reports, including the claim that 70% see benefits within 16 weeks.
Are both suitable for vegans?
Yes. Both are vegan, dairy-free and gluten-free capsules with no smell or taste.

Ask our shopping agent

It checks today's price at every store, compares the alternatives and answers in about a minute.

Enter to send, Shift+Enter for a new line

More comparisons

  • Fatty15 3-Pouches vs Fatty15 Advanced Formula Extra Strength Starter Kit
  • Fatty15 3-Pouches vs Fatty15 Starter Kit