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Katsuo Stamina is an endurance sports supplement that improves performance on the day of exercise. There are three main effects you can expect: 

・Quickly converting lactic acid that cannot be processed into energy during exercise to improve performance 

・Effectively relieving muscle fatigue and muscle pain by reducing the rise of CK (Creatine Kinase) levels in blood 

・Significantly helping relieve leg cramps caused by muscle fatigue

It is ideal for long-distance & endurance sports such as marathons, trail running, cycling, triathlons, mountaineering, swimming, surfing, climbing, soccer, baseball, MMA, rowing and skiing.

Katsuo peptide, the active ingredient in Katsuo Stamina, can help speed up the breakdown of lactic acid in the body during exercise, thereby reducing muscle soreness and muscle fatigue. The reduction in muscle pain can reduce the likelihood of injury to some extent.

It can effectively relieve leg cramps caused by muscle fatigue. There are two main factors that contribute to leg cramps, electrolyte deficiency and abnormal nerve transmission due to muscle fatigue. The best way to deal with leg cramps caused by the former is to replenish water and electrolytes. In cases of leg cramps due to muscle fatigue, Katsuo Stamina can be helpful.

Katsuo Stamina does not directly help with weight loss. However, because this product has the effect of enhancing sports performance and reducing muscle fatigue, it can indirectly help you lose weight successfully.

This product does not directly help with fitness or muscle building, but it has an accelerated recovery effect that can help you push past your limits in less time.

The feeling of effectiveness is influenced by your athletic ability, physical condition on the day, and the difficulty of the exercise. Please use Katsuo Stamina correctly according to the intake advice.

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The functional ingredient in this product is Katsuo peptide. It is an imidazole dipeptide extracted from natural Katsuo fish (bonito). Two packages of Katsuo Stamina contain the active ingredient equivalent to about 1.5 kilos of Katsuo fish (about 105 pieces of Katsuo sashimi). Other ingredients are crystalline cellulose, shellac, magnesium stearate, and tricalcium phosphate.

No, Katsuo Stamina does not contain any Gelatin or gluten, nor does it contain any common allergy-causing substances. However, if you are extremely prone to allergies, we recommend that you consult your doctor before taking it.

Please refer to the DIRECTIONS & RECOMMENDED USE section in order to better understand usage instructions.

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It is necessary to take it before and during exercise in order to convert the lactic acid in the blood that builds up during exercise into energy efficiently, and to reduce the CK (Creatine Kinase) levels, which cause muscle fatigue and muscle damage. Ingested Katsuo peptides are absorbed and stored in the body, which helps to improve endurance and reduce muscle damage during exercise.

It is NOT a substitute for electrolytes or energy supplements. The benefits of Katsuo peptide are to promote lactate degradation, reduce muscle damage, and reduce muscle spasms. It does not provide electrolytes or energy directly, so it can be taken at the same time as electrolytes and energy supplements.

Yes. It can be used in conjunction with other supplements.

As it is a sports and nutrition supplement, it is generally safe to take, but if you have a chronic illness, please consult with your doctor before taking it.

We have clarified the basis for the safety of our products by conducting safety tests. As it is derived from natural Katsuo fish, there is no such thing as an overdose, however, it should be used within the recommended dosage.

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As it is in tablet form, the taste is almost imperceptible. However, when it dissolves on the tongue, you can taste the fish, so please swallow it without chewing it. If you don't like the smell and taste of fish, you can drink it with juice or your favorite sports drink.

Children of elementary school age and up can use it safely. It is useful for various school sports events that require sustained endurance exercise. If your child is in elementary school or younger, please consult a doctor.

Due to the natural fish extract, there is little chance of gastrointestinal distress. It can be taken on an empty stomach.

It is manufactured in Japan at a plant that is cGMP-certified. cGMP is a quality standard for health foods and other products set by the U.S. FDA government agency, and is a guideline used in more than 100 countries. The entire process, from raw material procurement to manufacturing and shipping, is thoroughly controlled to ensure that no matter who manufactures the product, there are no variations or differences in ingredients, and no foreign substances are mixed in. The goal is to produce products of consistent quality.

As it is a sports and nutrition supplement, it is generally safe to take, but if you have a chronic illness, please consult with your doctor before taking it.

Katsuo Stamina does not contain any such substances. We have both INFORMED-CHOICE and INFORMED-SPORT global anti-doping certification from the World Anti-Doping Agency (WADA)-designated laboratory, the LGC Organization. Katsuo Stamina is manufactured at one of the few cGMP-certified factories in Japan, and all of the ingredients are made domestically to ensure the highest quality. It is widely used in Japan by athletes and sports enthusiasts, as well as members of the Japan Self-Defense Forces.

Informed Sport was specifically created in 2008 to cater to all elite athletes and drug-tested personnel, such as the military, who are subject to strict doping control and random drug testing to minimize the risks associated with supplement use. It is the only global third-party testing and certification program that tests every single batch of a product prior to it being released to market. Informed Sport ensues supplements are analyzed for substances banned by sporting bodies such as the World Anti-Doping Agency (WADA), collegiate organizations and other professional organizations. Products that have passed the stringent INFORMED-SPORT certification are guaranteed to be of the highest quality.

Store in a cool, dry place. Please consume immediately after opening the package. As this product contains natural ingredients, the color and fragrance may vary. However, this does not affect the quality of the product.

This product has a shelf life of 2 years. All specific production information is shown on the product packages.

We accept credit card payments (VISA, Mastercard, American Express), as well as PayPal, Shop Pay, Google Pay and Apple Pay. You can make your choice during checkout.

We support overseas shipping. You can check the shipping information during checkout. 

*Due to the COVID-19 pandemic in some countries, delivery service is suspended. If you are unable to select the country you want the product sent to when you complete the checkout process, please contact customer service (info@staminasports.com).*

All orders are processed within 3 business days. Currently we only offer standard international shipping. You can check the shipping cost and the approximate number of shipping days at checkout.

Due to the different import tariff standards of each country, if a given country wants to collect a tariff on the goods when delivering the parcel, the buyer must pay on delivery.

After the product is shipped, we will send you an email with the order information. You can find the tracking method in the email.

Important! Due to the situation surrounding air parcel delivery in overseas areas, and the difficulty in completion of cross-country refunds, we are unable to provide return and exchange services for overseas orders. Please be careful to confirm the details of your order. If you receive a defective or incorrect product, please provide a photo of the defect within 7 days from the day you receive the parcel to the mailbox〈info@staminasports.com〉and leave your order information in the email. We will help you deal with the issue as soon as possible.