This product is a big hit product that win #1 for 7 consecutive months in Japan to reduce abdominal fat. It contains isoflavones derived from kudzu flowers (as tectrigenins). Kuzunohana-derived isoflavones (as technotrigenins) have been reported to help obese people reduce weight, abdominal fat (visceral fat and subcutaneous fat) and waist circumference. This food is suitable for those who are overweight, have a high BMI, are concerned about abdominal fat, and are concerned about waist circumference.
People who want to reduce stubborn belly fat safely and naturally
Those with high BMI (25+) seeking clinically-proven abdominal fat reduction
Individuals concerned about visceral fat and waist circumference measurements
Adults aged 25-65 looking for Japan's #1 fat metabolism supplement
Post-diet maintainers looking to prevent weight regain and metabolic slowdown
Health-conscious individuals prioritizing pharmaceutical-grade Japanese quality over Western diet pills
Those who've tried other supplements without measurable results on belly fat
Busy professionals needing convenient, stimulant-free metabolism support throughout the day
The manufacturer researched its effects toward people who are 25 years old to 65 years old, then it found abdominal fat reduced by 23 cm.
How It Works+
Product features
Suppress the synthesis of fat: The excess energy that cannot be burned is synthesized into triglyceride by the liver work, and is accumulated as body fat in each part of the body. “Kuzu flower-derived isoflavones" are proved to suppress the synthesis of triglycerides
Promote the breakdown of fat: the fat accumulated in the body cannot be consumed as energy as it is, so it is decomposed into fatty acids. “Kuzu flower-derived isoflavones" break down fat in white adipocytes.
Promote fat burning: Body fat protection, which has been decomposed to become fat-proof, is burned in the color adipocytes. “Kuzu flower-derived isoflavones" supports the function of these brown fat-proof cells and promote fat burning
Onaka's pharmaceutical-grade formulation leverages kudzu flower-derived isoflavones (tectrigenins), a uniquely potent botanical compound that targets abdominal fat through three scientifically-validated mechanisms working simultaneously in your body.
First, it suppresses new fat formation: When your body has excess energy from food, your liver converts it into triglycerides that get stored as body fat. Kudzu flower isoflavones intervene in this process, reducing triglyceride synthesis so less incoming energy becomes stored fat. Second, it activates fat breakdown: The isoflavones stimulate white adipocytes (fat storage cells) to break down existing stored fat into fatty acids that can be mobilized and used for energy. Third, it accelerates fat burning: Once broken down, these fatty acids are transported to brown adipocytes, where kudzu flower isoflavones enhance mitochondrial activity to burn fat more efficiently as fuel.
Clinical research on adults aged 25-65 demonstrated average abdominal circumference reduction of 23 cm over the study period, with measurable decreases in both visceral (around organs) and subcutaneous (under skin) abdominal fat. Most users notice initial changes within 8 weeks, with optimal results after 12 weeks of consistent daily use.
Direction For Use+
Take 4 tablets once daily with a full glass of water or other beverage
Swallow tablets whole without chewing for optimal absorption of active ingredients
Take at a consistent time each day (morning or evening) to maintain steady metabolic support
Use continuously for at least 8-12 weeks to experience measurable fat reduction results
Do not exceed 4 tablets per day; follow recommended dosage for safety and efficacy
Best Practices: Take with a meal to enhance absorption and minimize any potential mild digestive adjustment during the first few days of use.
Expected period to see the effects: It depends on individuals. Generally people would see the result of lost weight in 2 months.
Note: Kudzu is a leguminous plant distributed from Japan to China and East Asia. The extract is derived specifically from the beautiful magenta flowers (kuzunohana) that bloom from summer to autumn, not from the root typically used in traditional medicine.
Safety Information & Precautions+
If you are pregnant or lactating, please consult your doctor before use as effects during pregnancy have not been established
If you are taking prescription medications, consult your healthcare provider to check for potential interactions, especially with diabetes or thyroid medications
If you have food allergies, please check the ingredient list carefully before consuming
Discontinue use if you experience any adverse reactions (digestive discomfort, skin rash, headaches) and consult a healthcare professional
In rare cases, this product may not suit your constitution or physical condition—if you feel unwell, stop use immediately
Please follow the recommended daily dose of 4 tablets and be careful not to exceed this amount
Store in a cool place away from direct sunlight and hot, humid environments to maintain product quality
This product has been notified to the Commissioner of the Consumer Affairs Agency as Foods with Function Claims at the responsibility of the business operator. However, unlike Foods for Specified Health Uses (トクホ), it has not been individually examined by the Consumer Affairs Agency.
This product is not intended for diagnosis, treatment, cure, or prevention of diseases
Balance your diet based on staple foods, main dishes, and side dishes for comprehensive health
Safety Note: Clinical trials showed no serious adverse effects when taken as directed. The most commonly reported initial experience is mild digestive adjustment (slight changes in bowel movements) that typically resolves within 3-5 days as your body adapts to the metabolic changes.
Product Specification+
Contents/Quantity: 120 tablets total (60 tablets × 2 boxes)
Serving Size: 4 tablets per day
Servings Per Container: 30-day supply (when taking recommended dosage)
Product Dimensions: 15.4 cm × 10.2 cm × 4.3 cm
Net Weight: 46 g per package
Tablet Format: Standard tablet (swallow whole, do not chew)
Shelf Life: 24 months from manufacture date (check packaging for specific date)
Storage Conditions: Store in a cool, dry place away from direct sunlight and high humidity
Product Classification: Foods with Function Claims (機能性表示食品) – Registered with Japan's Consumer Affairs Agency
Country of Origin: Made in Japan
Quality Standard: Manufactured under strict Japanese pharmaceutical-grade quality control standards
Manufacturer+
Pillbox Japan Inc.
About the Manufacturer:
Pillbox Japan Inc. is a reputable Japanese health products manufacturer specializing in functional foods and dietary supplements. The company adheres to Japan's rigorous manufacturing standards and quality control protocols, ensuring each product meets pharmaceutical-grade specifications. As the creator of the #1 best-selling abdominal fat reduction supplement in Japan for 7 consecutive months, Pillbox Japan has established itself as a leader in metabolic health innovation, combining traditional Japanese botanical knowledge with modern nutritional science.
1. Is Onaka safe? What are the actual side effects I should be concerned about?
Onaka meets Japan’s pharmaceutical-grade standards and uses safe kudzu flower extract. Some may experience mild digestive changes at first, but it’s caffeine-free and non-stimulant. Consult your doctor if pregnant or taking medication.
2. How long does it take to see results, and what kind of results can I expect?
Most users feel more energy within 2–4 weeks, see waist reduction around 8 weeks, and achieve best fat loss after 12 weeks. Results vary, but combining Onaka with balanced diet and exercise maximizes effectiveness.
3. Why did Onaka become #1 in Japan for 7 consecutive months?
Onaka stands out in Japan for targeting visceral fat, a key health concern linked to metabolic risks. Clinically proven, stimulant-free, and government-registered, it safely supports fat metabolism in three stages under Japan’s strict manufacturing standards.
4. How is Onaka different from other fat-burning supplements?
Onaka’s kudzu flower isoflavones naturally regulate fat metabolism without stimulants or diuretics. It targets visceral and subcutaneous belly fat, not water weight, and is clinically proven and officially registered as a Japanese Foods with Function Claims product.
5. Do I need to diet or exercise while taking Onaka?
Onaka enhances your natural fat metabolism but works best with balanced habits. Maintain normal eating with protein and vegetables, limit sugar, stay hydrated, and move at least 30 minutes daily—walking is enough to boost results.
6. Can I take Onaka with other supplements or medications?
Onaka is safe with basic supplements like vitamins, omega-3s, and collagen but shouldn’t be mixed with other fat-burning products. Consult your doctor if on medication, and take it at least two hours apart from prescriptions.
7. Will the fat come back after I stop taking Onaka?
Onaka boosts metabolism while you take it, but lasting results come from healthy habits built during use. Many continue with a lower maintenance dose or cycle usage, pairing it with balanced eating and regular activity.
8. Why is kudzu flower extract special for fat loss?
Kudzu flower (Pueraria lobata) is rich in rare isoflavones that regulate fat metabolism. They reduce triglyceride synthesis, activate fat breakdown, and boost energy burning in brown fat cells, offering a natural, triple-action metabolic effect.
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