Klean Athlete focuses on developing formulas to support training, recovery, and nutritional needs. It offers formulations that may help maintain energy levels, support muscle function, promote hydration, and contribute to nutritional balance.
The brand’s product lineup includes protein powders, electrolytes, amino acids, multivitamins, minerals, and other performance-focused formulas. It states that its offerings may support endurance, strength training, recovery, and hydration.
This review will examine Klean Athlete’s product range and the types of formulas it offers. It will also look at the brand’s potential strengths and limitations, along with consumer feedback, to understand how its products are experienced by users.
About Klean Athlete
Founded in 2012 by Douglas Laboratories, Klean Athlete combines science-based formulations with ingredients selected to support active lifestyles and structured training routines.
The brand’s product portfolio covers multiple sports nutrition categories. According to the brand, its products are GMO-free and formulated without wheat, gluten, artificial coloring, flavoring, or sweeteners. The company also states that its products are manufactured in NSF-GMP-registered facilities in the United States. It mentions conducting testing in ISO 17025-accredited laboratories, alongside third-party testing to evaluate safety, quality, and consistency.
As per the official website, Klean Athlete highlights sustainability initiatives such as recyclable packaging, reduced virgin plastic usage, renewable electricity adoption, and recycling partnerships with TerraCycle.
Bestsellers
Klean Multivitamin
Klean Multivitamin may support your daily nutritional needs if you engage in regular physical activity. It may help your body maintain normal metabolic activity and assist in post-exercise muscle restoration.
As per the official website, Klean Multivitamin contains vitamin D3, which may help your body absorb calcium from food that might help maintain bone density and structural support.
The makers also added vitamin E to this formula, which could help protect cells from oxidative stress. During intense exercise, the body can produce higher levels of free radicals due to increased oxygen use. Vitamin E may help reduce the impact of these molecules on cell membranes and tissues, supporting overall cellular stability and normal recovery processes.
Klean Multivitamin also has thiamine, which supports the function of enzymes involved in energy production. It also contributes to normal nerve signaling, which helps maintain coordination and muscle communication during movement.
Klean Collagen+C
Klean Collagen+C may support joint and connective tissue health. The formula combines hydrolyzed bovine collagen with vitamin C sourced from organic amla fruit. Collagen provides structural proteins used throughout the body, while vitamin C contributes to the body’s natural collagen production processes.
Hydrolyzed collagen in this formula might help maintain connective tissues and support normal joint function. It could also contribute to maintaining the integrity of tissues that experience repeated mechanical stress.
The makers added vitamin C in Klean Collagen+C, which could help enzymes stabilize and strengthen newly formed collagen fibers. This process is important for maintaining connective tissues, skin structure, and cartilage.
Klean Omega
Klean Omega is formulated to provide omega-3 fatty acids sourced from fish oil in triglyceride form. Omega-3 fats are involved in maintaining cardiovascular function, supporting brain activity, and helping regulate inflammatory responses that affect joints and tissues. Marine triglyceride concentrate is the primary ingredient in this formula and serves as a concentrated source of EPA and DHA omega-3 fatty acids. The makers state that this formula can help maintain membrane flexibility and support normal communication between cells. EPA could support the body’s natural inflammatory balance, which can be relevant for joint comfort and recovery after physical activity. DHA contributes to brain and nerve cell structure and might support better cognitive and neurological function.
Klean-D 5000 IU
Klean-D 5000 IU provides a concentrated dose of vitamin D3 in tablet form. Vitamin D can support better bone maintenance, muscle activity, and immune support. As per the official website, Klean-D 5000 IU could support bone density and skeletal stability, which are essential if you place repeated stress on your bones during physical activity or training. The makers state that vitamin D3 could also support immune responses by helping the body regulate immune cell activity.
Klean Creatine
According to the official website, Klean Creatine provides creatine monohydrate, which works by increasing the availability of phosphocreatine in muscle cells. It helps regenerate adenosine triphosphate that is used during rapid and high-intensity muscle contractions. The makers state that Klean Creatine can help maintain power output for slightly longer periods during repeated efforts. It may also contribute to improved training capacity.
Creatine also plays a critical role in muscle recovery. It may help support cellular hydration and reduce some of the metabolic stress that occurs after intense exercise. Creatine monohydrate could support strength training and high-intensity athletic performance by supporting the body’s natural energy systems and muscle repair processes.
Klean Probiotic
Klean Probiotic may help maintain better digestive balance. The formula includes Lactobacillus acidophilus, which helps break down certain carbohydrates and supports the production of lactic acid. This may help create an environment that discourages the growth of unwanted bacteria.
The makers also added Lactobacillus rhamnosus in this product, which might help maintain microbial balance and support the intestinal barrier. This barrier helps regulate what passes from the digestive tract into the bloodstream, which is important for maintaining normal digestive and immune responses.
As per the official website, Klean Probiotic also has Bifidobacterium lactis (HN019), which supports the production of short-chain fatty acids. These actions can contribute to maintaining intestinal health and supporting normal bowel activity.
Klean Magnesium
Klean Magnesium may support energy production, muscle function, and recovery. Magnesium could support the production and use of adenosine triphosphate, which allows cells to release and transfer energy needed for muscle movement, nerve signaling, and other metabolic processes. It might also support the body’s ability to generate and utilize energy during physical activity. The makers mention that this formula can support smoother muscle function and coordination. Magnesium also supports post-exercise recovery by helping regulate nerve signaling and supporting protein synthesis within muscle tissue. These processes assist the body in repairing and maintaining muscle fibers after physical exertion.
Klean Isolate
As per the official website, Klean Isolate supports maintaining muscle tissue. The formulation contains branched-chain amino acids, which are involved in stimulating muscle protein synthesis. This process helps the body rebuild muscle fibers that experience stress or small tears during exercise.
As whey isolate is rapidly digested, the amino acids become available to the body relatively quickly after consumption. This can support muscle recovery following physical activity by supplying the nutrients needed for the tissue repair process.
The makers also added sunflower lecithin in this formula, which helps improve the powder’s ability to mix with liquids. Lecithin contains naturally occurring phospholipids that assist in blending ingredients and maintaining a smoother texture when the powder is mixed.
Klean Athlete Advantages
Professional Sports Partnership Network
Klean Athlete claims to supply products to a large network of professional and collegiate sports teams. The company states that its products are used by more than 350 teams, including athletes, coaches, trainers, and sports dietitians across organizations connected to the Major League Baseball, National Hockey League, and National Football League, as well as minor league and international competitors.
The brand also claims that all products carry the NSF Certified for Sport certification. This program screens products for more than 280 banned substances and verifies label claims. Professional sports leagues such as the NFL and MLB also recognize these certification standards.
Recognized Corporate Backing
Klean Athlete states that it operates within the portfolio of Nestlé Health Science, a business unit of Nestlé focused on science-based nutrition products. In 2021, Nestlé Health Science expanded its portfolio by acquiring the core brands of The Bountiful Company, which brought several nutrition and wellness brands under the same corporate structure as Klean Athlete.
The brand is also linked to Atrium Innovations, another company within the Nestlé Health Science framework. Atrium Innovations is involved in developing and manufacturing science-based nutrition products and contributes to research, formulation support, and production capabilities within the broader sports nutrition category.
Through its position within this structure, Klean Athlete claims access to larger corporate resources such as global supply chains, specialized product development teams, and nutrition science research programs. Large-scale corporate infrastructure may also support consistent manufacturing processes and operational stability.
Established Sports Nutrition Brand
Klean Athlete was launched in 2012 under Douglas Laboratories, which operated within Atrium Innovations. The brand was developed with early leadership connected to people involved in competitive sports. One such figure is Timothy Monk, a senior executive at Douglas Laboratories during the brand’s launch, who is also known as an endurance athlete.Over the past decade, Klean Athlete has expanded its presence within the sports nutrition sector. The company states that its products are used by 350+ professional and collegiate sports teams. A brand that has spent over a decade working in sports nutrition and collaborating with organized athletic programs may have deeper familiarity with the performance, recovery, and compliance requirements. This experience may indicate that the products are designed with structured training routines and sports testing standards in mind.
Klean Athlete Limitation
Limited Brand Awareness Outside Athletics
Klean Athlete has limited visibility outside athletic and competitive sports communities. The brand primarily targets organized sports and performance-focused users, which narrows its presence compared with companies that market broadly to everyday wellness consumers. Klean Athlete appears less often in mainstream wellness marketing channels that promote products for daily nutrition, immunity, or general lifestyle health. You may encounter Klean Athlete less frequently when searching for products for everyday health needs. This could limit your awareness of the brand or reduce the chances of comparing it alongside more widely promoted wellness options.
Klean Athlete Alternatives
Skratch Labs
Skratch Labs and Klean Athlete operate in the sports nutrition category, but their product strategies and performance focus differ noticeably. As per its official website, Skratch Labs concentrates on fueling and hydration products designed for use during physical activity. Its catalog includes hydration formulas such as the Hydration Sport Drink Mix, available in eight flavors, as well as the Unsweetened Hydration Sport Drink Mix. The brand also provides higher carbohydrate fueling options like the Super High-Carb Sport Drink Mix. On the other hand, Klean Athlete focuses more on traditional sports formulas that support athletic nutrition rather than on-course fueling. Its lineup includes products such as Klean Multivitamin, Klean Creatine, Klean Isolate protein powder, and Klean Collagen+C, alongside vitamin D formulations like Klean-D 5000 IU and 1000.
Skratch Labs provides portable fueling products such as Energy Chews Sport Fuel and Energy Bar Sport Fuel, which use nut butter, oats, ancient grains, and fruit. Its recovery category includes the Recovery Sport Drink Mix, along with a Vegan Oat Milk Latte version. Meanwhile, Klean Athlete’s product categories instead emphasize nutritional around training sessions, including protein powders, electrolytes and energy formulas, pre- and post-workout formulas, creatine and amino acid products, vitamins and minerals, and sleep and focus formulas.
Manufacturing and distribution details further illustrate their operational differences. Skratch Labs states that its products are manufactured and assembled in the United States, with its headquarters and warehouse located in Boulder, Colorado. The brand offers its products through its online store and promotes perks such as free U.S. shipping on orders over $49 and loyalty rewards programs. Meanwhile, Klean Athlete also emphasizes U.S.-based manufacturing but positions its operations around strict testing and quality standards.
Skratch Labs centers its offerings on hydration, carbohydrate fueling, and real-food-inspired performance nutrition designed for endurance activities. Klean Athlete focuses on scientifically formulated formulas such as vitamins, proteins, creatine, and recovery nutrients that support athletes’ broader nutritional needs before and after training.
Transparent Labs
Transparent Labs offers an extensive portfolio organized around building lean muscle, recovery, gut health, immunity, health and longevity, and performance and energy. Its product catalog includes protein powders, along with sports performance formulas such as Bulk Pre-Workout, Lean Pre-Workout, and Nitric Oxide. The brand also expands into recovery and wellness products like Hydrate, Sleep & Recover, Cognition, and Cortisol Balance. Transparent Labs includes more specialized formulations, such as Longevity Healthy Aging Complex, alongside nutrition products like Protein Pancakes and lifestyle options, including branded apparel. On the other hand, Klean Athlete is more focused on essential sports nutrition categories. Its offerings include products such as Klean Multivitamin, Klean Collagen+C, and Klean Isolate protein powder, along with electrolytes, amino acids, and sleep-support formulas.
The ingredient philosophy between the two brands also shows clear differences. Transparent Labs emphasizes natural and grass-fed ingredient sourcing and states that its formulas contain no artificial sweeteners, dyes, fillers, or preservatives. For example, its Grass-Fed Whey Protein Isolate is derived from grass-fed cattle and is promoted as a clean protein source. Klean Athlete, on the other hand, emphasizes strict ingredient purity and allergen transparency. According to its product standards, the entire line is GMO-free and said to be made without using wheat, gluten, artificial coloring, flavoring, or sweeteners. The company also performs PCR testing for some nutrients to verify the absence of genetically modified material.
Manufacturing and testing practices also illustrate a structural difference between the two brands. Transparent Labs states that it independently tests every product and publishes the results, and some products carry Informed Choice and Informed Protein certifications. Klean Athlete, however, places stronger emphasis on regulated manufacturing systems and sports-specific certification standards. Its products are manufactured in NSF-GMP registered facilities in the United States, and the brand produces formulas approved under the NSF Certified for Sport® program. The company’s quality system includes ISO/IEC 17025-accredited in-house laboratories and a Vendor Certification Program (VCP) that audits raw material suppliers.
Another difference appears in the functional scope of their categories. Transparent Labs extends beyond sports performance into areas such as longevity support, cognitive function, hormone balance, metabolic health, and stress management, reflected in formulas like Dopamine+ and Tongkat Ali LJ100®. On the other hand, Klean Athlete’s lineup remains more focused on foundational sports nutrition support such as vitamins, minerals, protein powders, creatine, electrolytes, collagen, probiotics, and sleep support, without expanding heavily into longevity or nootropic categories.
Pros
- NSF Certified for Sport products.
- The brand claims that its offerings are manufactured in NSF-GMP facilities.
- Maintains U.S. manufacturing quality standards.
Cons
- Minimal ingredient sourcing transparency.
- Few clinical study references are publicly listed.
How Did We Evaluate?
Real User Experiences
To evaluate Klean Athlete, we examined verified customer feedback on Amazon across some of the brand’s widely used products. The brand’s Creatine holds a 4.6 rating based on 2,014+ reviews, reflecting generally strong user satisfaction. Many users describe the powder as tasteless and can be mixed with protein shakes, water, or pre-workout drinks. Users frequently associate the product with improved workout performance, including better strength during resistance training, and faster recovery between workouts. However, a few users noted that the included scoop measures closer to 4 grams instead of the recommended 5-gram serving, which requires using a scale or adjusting the scoop amount.
Its Klean Magnesium has received a 4.6 rating based on 283+ reviews. Many users mention that taking the formula at night has helped them with better relaxation or sleep. Customers frequently describe the capsules as easy to swallow and gentle on the stomach, with no noticeable aftertaste.
Based on this feedback, Klean Athlete appears to prioritize clean formulations, third-party certification, and simple ingredient profiles. At the same time, minor usability concerns, such as scoop measurement accuracy or occasional mixing issues, are reported by some users among its key offerings.
Brand Reputation
Klean Athlete appears to be a relatively established sports nutrition brand founded in 2012. It emphasizes a certification program that tests products for banned substances and verifies manufacturing practices. At the time of writing this review, the brand appears to have a limited presence on major consumer feedback platforms, including BBB, Yelp, and ConsumerAffairs. It does not appear to have listings or an active profile on these platforms.
Frequently Asked Questions
The brand highlights testing for over 290 banned substances and notes batch testing for contaminants. However, it does not publicly disclose specific numerical testing limits or ppm thresholds for these contaminants.
The brand lists ingredient names and quantities on product labels, but it does not disclose detailed standardization metrics such as active compound percentages or extraction ratios. It highlights supplier audits and cGMP manufacturing, yet precise extract potency details are not publicly provided.
The brand does not strictly categorize its products for endurance or strength training. Instead, its website groups products under Foundation, Performance, and Specialty categories. For example, Klean Endurance supports aerobic activity, while Klean Creatine targets muscle power and recovery.
Conclusion
Klean Athlete states that its formulations rely on research-informed ingredients commonly used in exercise nutrition, including amino acids, electrolytes, creatine, and vitamins. However, the brand’s strong alignment with organized athletics may limit its relevance outside performance-focused training. Formulations may be more specialized than necessary for general wellness, and products with sport certification can carry higher costs.
When considering the brand and its offerings, it is essential to review ingredient dosages carefully. If you already use multivitamins or performance products, nutrients such as creatine or high-dose vitamins may only be beneficial when your training intensity and diet require them. Make sure to assess whether ingredients such as creatine or concentrated electrolyte blends align with your hydration status, kidney health considerations, or training intensity.
- About the Author
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Alisha Matthew has been a practicing nutritionist since 2016. She holds a master’s degree in nutrition from the University of IOWA. She is a staunch believer in improving the human health index by educating people about nutrition and the importance of nutrition in leading a healthy and happy life. Her long-term goal is to keep educating people on general health and keep herself updated with the latest trends in the field of health.