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Japan's #1 metabolism support formula for 8 consecutive years. Now available in America for the first time.

Block 25% of Calories From Every Meal—Proven in 4 Clinical Trials

You're Not Eating More. Your Body Changed The Rules. 

Clinical: 15cm² Belly Fat Reduction in 12 Weeks

Why Choose FANCL Metabolism Formula?

4.2/5 from 4,200+ verified reviews

2 Million+ bottles sold in Japan

4 Published clinical trials

E864 Certified by Japan Consumer Affairs Agency

LOCK IN MY SUPPLY - LIMITED US STOCK

4200 4.2/5-Star Reviews

What Women Over 45 Are Saying

How FANCL Shields Your Changing Metabolism

Unlike stimulant-based "fat burners" that just rev up your heart rate and make you jittery, FANCL addresses the THREE biological changes that happen after 45

This isn't appetite suppression. This isn't stimulants. This is direct intervention on the fat-storage mechanism that changed after 45. NOT a diet. Not a meal plan. Not a restrictive protocol. This is targeted metabolic support that addresses the ROOT CAUSE of age-related weight management challenges.

Trusted KOC Voices

What Real Users Say

Customer Testimonials

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Who is JapansPrime

We're  FANCL's Official US Partner. We're the exclusive US importers who bring Japan's #1 wellness products to American women. 
Our story:
 For 3 years, we traveled Japan researching the #1 metabolism products Japanese women use after 45. FANCL kept coming up everywhere: 

✓ Sold in 20,000+ convenience stores across Japan 
✓ #1 metabolism formula for 8 consecutive years
 ✓ 2 million+ active users 
✓ 20-year track record of safety and efficacy But it was never available in America. 

So we partnered directly with FANCL to become the exclusive US importer. 

We're not just resellers—we're expert curators who vet, test, and bring the best of Japanese wellness science to American women. 

Every bottle ships directly from our climate-controlled facility to ensure maximum potency and freshness.

Backed by Japanese Science & Medical Standards

Real People. Real Results.

What Other American Women Are Saying

4200+ 4.2-Star Reviews

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How is this different from "fat burners" I can buy at GNC or Walmart?

The differences are substantial:

 

Most fat burners:

  • Use stimulants (caffeine 200-400mg, synephrine, yohimbine) that cause jitters and crashes
  • Contain 1-2 generic ingredients with inconsistent dosing
  • Have zero clinical research backing their specific formula
  • Use "proprietary blends" that hide actual ingredient amounts
  • Only work through stimulation (temporary effect)

FANCL Adult Calorie Limit:

  • ✅ Completely stimulant-free
  • ✅ Four clinically-studied ingredients at precise doses
  • ✅ Four separate published clinical trials
  • ✅ Complete label transparency (exact amounts listed)
  • ✅ Dual mechanism: blocks absorption + enhances fat metabolism
  • ✅ Pharmaceutical-grade GMP manufacturing
  • ✅ Government-notified health claims (Japan E864)
  • ✅ 20+ year track record with 2M+ users

The biggest difference: This addresses the ROOT CAUSE (changing metabolism) instead of just artificially stimulating energy expenditure.

Can I take this if I'm on medication (diabetes, blood pressure, etc.)?

A: This depends entirely on your specific medications and health conditions.

 

YOU MUST CONSULT YOUR DOCTOR BEFORE STARTING if you:

Have diabetes or pre-diabetes

  • Mulberry leaf affects blood glucose levels
  • May enhance effects of metformin, insulin, or other diabetes medications
  • Risk of hypoglycemia if not monitored

Take blood pressure medications

  • Potential for interactions with metabolic changes
  • Doctor should monitor blood pressure during initial weeks

Take thyroid medication

  • Generally safe to combine, but thyroid levels should be monitored
  • Metabolic changes may affect thyroid medication effectiveness

Take blood thinners

  • Chitosan may affect absorption of fat-soluble medications
  • Timing of doses needs to be coordinated

Take cholesterol medications

  • Chitosan affects lipid absorption
  • May enhance statin effects

Take any prescription medications

  • General rule: Always inform your doctor before starting any supplement
  • Many medications are fat-soluble and could have altered absorption

SAFE WITH (generally, but still inform your doctor):

  • Most vitamins and supplements
  • Birth control pills (take 2+ hours apart to be safe)
  • Pain relievers (acetaminophen, ibuprofen)

Do I need to diet or exercise while taking this?

A: No strict diet or intense exercise required—but let's be realistic about expectations.

 

What FANCL Does:

  • Reduces calorie absorption by 15-25%
  • Improves blood sugar control by 20-30%
  • Enhances fat metabolism

What FANCL Doesn't Do:

  • Completely override terrible eating habits
  • Replace the need for any movement at all
  • Create results with zero behavior changes

The Best Results Come From:

 

Eating:

  • Generally mindful portions (not unlimited, not restrictive)
  • Adequate protein (0.7-1g per lb bodyweight for body composition)
  • Mostly whole foods with occasional indulgences
  • Consistent meal timing (doesn't have to be perfect)

Moving:

  • 20-30 minutes daily activity (even just walking)
  • Resistance training 2-3x/week (preserves muscle during fat loss)
  • Daily life movement (taking stairs, parking farther, etc.)

Living:

  • 7-8 hours of sleep (crucial for metabolism)
  • Stress management (cortisol affects fat storage)
  • Adequate hydration (supports all metabolic processes)

Think of it this way:

  • Diet alone = 70% of results
  • Exercise alone = 20% of results
  • FANCL adds = 10-20% boost to your existing efforts

FANCL makes your existing healthy habits MORE EFFECTIVE. It doesn't replace them.

That said, customers with medical limitations (chronic pain, mobility issues, injuries) report benefits even with minimal exercise—because it supports metabolism through non-activity-dependent mechanisms.

I'm allergic to shellfish. Can I take this?

A: Unfortunately, no. This product is NOT safe for shellfish allergies.

 

Why: The chitosan in this formula is derived from crustacean shells (crab/shrimp). While it's processed and purified, it still contains shellfish proteins that can trigger allergic reactions.

If you have a shellfish allergy:

  • ❌ Do NOT take this product
  • ❌ Do not "test" a small dose to see if you react
  • ❌ Do not take it even if your allergy is "mild"

The risk is not worth it. Even trace amounts can trigger reactions ranging from hives to anaphylaxis in sensitive individuals.

Alternative Options: If you're specifically interested in the blood sugar control mechanism (mulberry leaf), FANCL offers other products without shellfish-derived ingredients. Contact customer support for recommendations.

Our priority is your safety—not making a sale.

How long does one bottle last, and when will I see results?

Duration:

One pouch contains:

  • 90 tablets
  • 30 servings (3 tablets per serving)
  • Duration depends on your usage frequency:

Usage Pattern:
 

How Long It Lasts
1 serving/day (once daily): 30 days

2 servings/day (twice daily):15 days

3 servings/day (three times daily): 10 days

 

Most customers take it 1-2 times daily, meaning one pouch lasts 15-30 days.

 

Timeline for Results:

 

IMMEDIATE (Within 2 hours of taking):

  • ✅ Sugar/fat absorption blocking is active
  • ✅ Post-meal blood glucose and triglyceride control

You won't "feel" this happening, but it's working at the digestive level

WEEK 1-2:

  • ✅ Reduced post-meal bloating (most commonly noticed first)
  • ✅ Feeling "lighter" after meals
  • ✅ Less pronounced food coma effect
  • ✅ Reduced gas and digestive discomfort

Early digestive comfort improvements

WEEK 3-4:

  • ✅ More stable energy throughout the day
  • ✅ Fewer cravings (due to better blood sugar control)
  • ✅ Weight fluctuations become less erratic
  • ✅ May notice pants fitting slightly better

Metabolic stabilization phase

WEEK 5-8:

  • ✅ Visible changes in body composition
  • ✅ Clothes fitting noticeably better
  • ✅ Face may look less puffy
  • ✅ Weight trend moving in desired direction (though may be slow)

Visual changes emerge

WEEK 9-12:

  • ✅ Measurable fat reduction (especially abdominal area)
  • ✅ Clinical studies show 15 cm² visceral fat loss by this point
  • ✅ If tracking: improved fasting glucose, triglycerides, A1C
  • ✅ Established new metabolic baseline

Clinical results timeline

BEYOND 12 WEEKS:

  • ✅ Continued gradual improvement
  • ✅ Long-term weight stability becomes easier to maintain
  • ✅ Many users continue indefinitely for ongoing metabolic support

REALISTIC WEIGHT LOSS EXPECTATIONS:

If actively losing weight:

  • Healthy rate: 0.5-1.5 lbs per week
  • Over 12 weeks: 6-18 lbs (depending on starting point and adherence)
  • Not dramatic, but SUSTAINABLE

If maintaining weight:

  • Goal: scale stability (no continued creep)
  • Success = maintaining within 3-5 lb range despite aging metabolism

Why the slow timeline?

This isn't a crash diet. This is metabolic support that works WITH your body's natural processes. Fast results typically:

  • Come from water loss (not fat)
  • Aren't sustainable long-term
  • Often lead to rebound weight gain

Slow and steady wins the race when it comes to lasting results.

Where is this manufactured, and what about FDA approval?

100% Made in Japan

  • Manufactured in FANCL's own GMP-certified facilities
  • Multiple pharmaceutical-grade production sites:
    • Biholon Co., Ltd. (Toyama)
    • FANCL Beauty & Health (Chiba)
    • FANCL Biken (Shizuoka)

Quality Certifications:

  • ✅ GMP (Good Manufacturing Practice) - pharmaceutical standards
  • ✅ FSSC 22000 - food safety system certification
  • ✅ ISO 22000 - international food safety standards

Every batch:

  • Tested for purity, potency, and contaminants
  • Includes lot tracking for complete traceability
  • Third-party laboratory verified

About "FDA Approval":

Important Clarification:

The FDA does NOT "approve" dietary supplements the way it approves prescription drugs.

Under US law (DSHEA - Dietary Supplement Health and Education Act):

  • Manufacturers are responsible for safety before marketing
  • FDA monitors products AFTER they reach market (post-market surveillance)
  • FDA takes action only if safety issues are reported

What This Product HAS:

✅ Japanese Government Notification (E864)

  • Submitted clinical research evidence to Consumer Affairs Agency
  • Government reviewed safety and efficacy data
  • Approved specific health claims based on evidence
  • This is MORE regulatory scrutiny than typical US supplements receive

✅ GMP Manufacturing Certification

  • Pharmaceutical-grade production standards
  • Independently audited facilities
  • Consistent quality and safety controls

✅ Published Clinical Trials

  • Four studies in peer-reviewed medical journals
  • Double-blind, placebo-controlled research
  • Publicly available data (not hidden "proprietary" research)

✅ Third-Party Testing

  • Every batch verified by independent laboratories
  • Certificate of analysis available on request

Legal Disclaimer (Required by US Law):

These statements have not been evaluated by the U.S. Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.

What this means in plain English:

  • FANCL cannot claim to "treat" or "cure" obesity or diabetes (those are disease claims requiring drug approval)
  • FANCL CAN support healthy metabolism, blood sugar management, and weight management (structure/function claims)
  • The clinical research shows real metabolic effects—we just can't use medical disease language in marketing

Why Trust FANCL?

While US supplements have minimal oversight, FANCL voluntarily:

  • Conducts expensive clinical trials (most companies don't)
  • Submits to government review in Japan (not required in US)
  • Manufactures in pharmaceutical-grade facilities (most use generic contract manufacturers)
  • Provides complete transparency on ingredients and dosing (no "proprietary blends")
  • Has 20+ year track record with 2M+ users (real-world safety data)

FANCL goes far beyond minimum requirements because reputation matters more than cutting corners.

What if I forget to take it before a meal?

A: Don't stress about perfection. Here's what to do:

 

If you remember DURING your meal (within first 10 minutes): → Go ahead and take it. You'll still get some benefit, though slightly reduced effectiveness.

 

If you remember AFTER finishing your meal: → Skip that dose. Taking it post-meal provides minimal benefit since food is already being digested.

 

If you miss a day or several days: → Just restart when you remember. No need to "double up" or take extra. Consistency over time matters more than perfection.

 

Think of FANCL like:

  • Brushing your teeth - If you miss one night, you don't brush twice the next night
  • Taking vitamins - Missing a dose doesn't require "catching up"

The goal is consistency, not perfection.

Most successful users:

  • Take it before their 1-2 largest meals
  • Don't worry if they occasionally forget
  • Get back on track the next meal
  • Focus on weekly/monthly consistency rather than daily perfection

Can I take this while pregnant or breastfeeding?

A: NO. Do not use this product if you are pregnant or nursing.

Why:

  • Clinical studies were not conducted on pregnant/nursing women
  • Changes in metabolism and blood sugar could affect fetal development
  • Effects on breast milk composition are unknown
  • Safety profile has not been established for developing infants

Pregnancy and breastfeeding are NOT the time to experiment with metabolic modifiers.

Alternative Approaches During Pregnancy/Nursing:

  • Focus on balanced, adequate nutrition (this is not the time for weight management)
  • Work with your OB/GYN on gestational weight gain goals
  • Address postpartum weight after you've finished breastfeeding

When You Can Start:

  • Wait until you've completely finished breastfeeding
  • Discuss with your doctor at your postpartum checkup
  • Consider waiting 3-6 months postpartum to allow hormones to stabilize

Your baby's health is the priority. Weight management can wait.

Will this interact with my vitamins/supplements?

Generally safe to combine with most vitamins and supplements, with a few considerations:

SAFE TO COMBINE WITH:

  • ✅ Multivitamins (take 2+ hours apart for optimal absorption of fat-soluble vitamins)
  • ✅ Vitamin D, Vitamin C, B-Complex
  • ✅ Magnesium, Calcium, Zinc (minerals)
  • ✅ Omega-3 fish oil (take 2+ hours apart)
  • ✅ Probiotics
  • ✅ Protein powders
  • ✅ Creatine, BCAAs (if you use fitness supplements)

TIMING CONSIDERATIONS:

  • Fat-soluble vitamins (A, D, E, K): Take 2+ hours before or after FANCL since chitosan binds dietary fats
  • Omega-3s/Fish Oil: Same timing consideration (2+ hours apart)

PROBABLY REDUNDANT (but not harmful):

  • ❓ Berberine (works on similar glucose pathways)
  • ❓ Other carb/fat blockers (redundant mechanism)
  • ❓ Cinnamon extract (blood sugar support - complementary but not necessary)

CHECK WITH DOCTOR:

  • ⚠️ Any supplement for blood sugar (may have additive effects)
  • ⚠️ Fiber supplements (chitosan is already a fiber)

The key principle: Since FANCL reduces absorption, space it 2+ hours away from anything you WANT your body to absorb (like vitamins or medications).

I have digestive issues (IBS, Crohn's, etc.). Is this safe for me?

This depends on your specific condition and you should consult your gastroenterologist.

Potential Considerations:

FOR IBS:

  • Chitosan is a fiber and may affect bowel movements
  • Some IBS patients report improvement (less bloating)
  • Others report worsening (more gas, constipation)
  • Start with 1 serving/day to test tolerance

FOR IBD (Crohn's, Ulcerative Colitis):

  • Fiber can be problematic during flares
  • May be better tolerated during remission
  • Discuss with your GI doctor before starting

FOR GERD/Acid Reflux:

  • Generally well-tolerated
  • Blood sugar control may actually help reduce reflux triggers
  • Take with adequate water

FOR GASTROPARESIS:

  • Tablets are small and easy to swallow
  • Slowing carb digestion might worsen symptoms
  • Discuss with your doctor

General Advice:

  • Start with 1 serving/day to assess tolerance
  • Take with 8-12oz water
  • If you experience worsening digestive symptoms, discontinue

Better safe than sorry—check with your GI specialist if you have diagnosed digestive conditions.

Do I need to take this forever?

No, but many people choose to continue long-term. Here's why:

The Reality of Metabolism:

Your metabolism naturally declines 2-3% per decade after 30. This decline doesn't stop just because you used FANCL for a few months.

Think of FANCL like:

  • 👓 Reading glasses - You need them because your eyes changed with age. You can take them off, but you'll need them again to read.
  • 🦷 Dental care - You don't brush your teeth for 3 months then stop. It's ongoing maintenance.
  • 💊 Blood pressure medication - Treats a chronic condition, not a temporary problem.

Three Usage Scenarios:

SCENARIO 1: Short-term use (3-6 months)

  • Goal: Break through a plateau or lose specific amount of weight
  • Approach: Use intensively during active weight loss phase
  • Transition: Stop once you hit goal weight, manage with diet/exercise
  • Risk: May experience some regain once metabolic support is removed

SCENARIO 2: Cyclical use

  • Goal: Maintenance with strategic support
  • Approach: Use during high-risk periods (holidays, vacations, stressful times)
  • Transition: Take breaks during stable periods
  • Works well for: People with good baseline habits who just need occasional support

SCENARIO 3: Long-term ongoing use (indefinite)

  • Goal: Continuous metabolic support as you age
  • Approach: Treat it like a daily vitamin—part of your routine
  • Philosophy: "I take this because my metabolism needs support, just like I take vitamin D because I don't get enough sun"
  • Works well for: People who accept aging metabolism as a chronic condition requiring ongoing support

Most Common Pattern:

  • Start intensively (2-3x daily) for first 3-6 months
  • Transition to maintenance (1x daily) for ongoing support
  • Take breaks occasionally to reassess if still needed
  • Resume if weight starts creeping back up

Customer data shows:

  • 40%+ continue using beyond 12 months
  • Most don't "need" it forever, but choose it because results matter

You're not trapped—you're choosing ongoing support for your changing metabolism.

90-Day

Our 90-Day Metabolic Shield Guarantee

📅 USE IT FOR UP TO 90 DAYS

After 90 days, ask yourself:

• Is my weight more stable?

• Do I feel more in control?

• Am I seeing the support I expected?

💰 GET 100% REFUND IF NOT SATISFIED

If you're not satisfied for ANY reason:

 

• Email info@japansprime.com

• Tell us it didn't work for you

• We'll refund every penny within 3-5 business days

• Even if the bottles are empty

 

 

No hassle. No hoops. No questions.

Your Body Changed. Your Defense Changes Too.

But you CAN give your body the support it needs for this new chapter.

Japan's #1 metabolism support formula for 8 consecutive years

2 million+ Japanese users (20-year track record)

4 clinical studies published in peer-reviewed journals

15cm² visceral belly fat reduction in 12 weeks (clinical result)

You can't reverse menopause.  
You can't turn back the metabolic clock.

But you CAN give your body the support it needs for this new chapter.

The choice is yours:

OPTION 1: Keep doing what you've been doing
- Watch your weight climb 2-5 lbs per year
- Feel increasingly frustrated as nothing works
- Accept "this is just how it is after 45"
- Miss activities you used to enjoy
- Feel trapped in a body that won't respond

OPTION 2: Give your metabolism the shield it's asking for
- Block 25% of calorie absorption from meals
- Support blood sugar control (20-30% improvement)
- Enhance fat metabolism for belly fat
- See results over 12 weeks (like 4,200+ verified customers)
- Regain confidence and control

You have 90 days to test this with ZERO RISK.

Either you experience the metabolic support you need...  
Or you get your money back.
 

What do you have to lose—except the weight you want to manage?
 

The only question is: Are you ready to feel in control again?

Yes, I'm Ready

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