Only a few performance-enhancing supplements have an adequate level of science-based support to suggest that performance gains are possible. At 6d sports nutrition we only sell performance enhancing supplements of which both the mechanisms of action, usage and typical dose for performance enhancement are well known and studied. The range currently includes caffeine based supplements and a beta-alanine supplement.


Energy Gel + Caffeine

Both mental and physical fatigue has a negative effect on endurance performance (> 90 minutes). In such situations, the intake of caffeine can help to maintain physical performance. This is mainly due to the central effect that caffeine has on the brain, lowering your perception of effort, which increases your pain threshold. In addition, the intake of caffeine can also promote mental sharpness or alertness.

6d ENERGY + CAFFEINE GEL contains 75mg of caffeine, in addition to 30g carbohydrates (in 2:1 carbmix) and 200mg sodium. Ideal in preparation for a short intensive effort, but also leading up to the most decisive moment of an (endurance) competition (e.g. steep climb or final of a race), where you might need an extra boost


Caffeine Chewing Gum

It is common knowledge that caffeine stimulates mental alertness, and can delay fatigue. Therefore, caffeine intake can enhance (endurance) exercise performance, but it can also boost performance in interval type sports (e.g. team sports).

In addition, the stimulating effects of caffeine delivered in the form of a chewing gum occur more quickly than when caffeine is ingested via capsules or tablets. Therefore, 6d CAFFEINE GUM can offer an additional advantage in situations when the start of a competition is unknown (e.g. tennis) and/or when a (very) rapid effect is desired (e.g. substitutions in team sports).


Beta Alanine SR Carnosyn®

Long-term ingestion of beta-alanine (e.g. CARNOSYN®) increases muscle carnosine stores. This increases the muscles buffer capacity which translates in enhanced exercise performance during sustained high intensity efforts lasting 0,5-10 minutes. These types of maximal efforts occur in track and field events, rowing and swimming, but also in team sports such as football, or during prolonged endurance events such as road cycling (e.g. steep climb or final of a race).

Sustained released tablets, such as 6d BETA-ALANINE SR CARNOSYN®, are more effective at increasing muscle carnosine stores. Also, the annoying skin tingling (paresthesia) doesn’t occur, in most athletes, after ingestion of 2 tablets (1600 mg) at the same time.


If you are looking to boost your recovery and your ability to train hard and compete day-after day, look no further. This category includes our all-in-one recovery formulas such as our 6d RECOVERY SHAKE, which rapidly repair and refuel the body after exercise, while providing fluids and electrolytes for rehydration. Also products that aid only one aspects of recovery, such as our specific (re)hydration product 6d HYDRO/ORS, are included in this category.


Recovery Shake

The 6d RECOVERY SHAKE” contains a mix of maltodextrin, sucrose, and fructose for a rapid restoration of the energy reserves (glycogen) in the body after exercise. The addition of 30g fast-absorbing whey protein speeds up muscle glycogen resynthesis even further. This protein dose, which also contains 3g leucine, also maximize muscle recovery. Finally, the high salt concentration quickly replenishes the fluid and electrolyte balance after exercise.

In summary, the 6d RECOVERY SHAKE is the ideal drink for all athletes looking for optimal muscle repair and rapid replenishment of lost fluids, electrolytes and sugars.


Hydro / ORS

The 6d HYDRO/ORS is a unique 2-in-1 product. The 6d HYDRO, as a single dose (1 sachet), is a low-calorie sports drink that provides the required amount of fluid and electrolytes, without the extra carbohydrates and sugars. The ideal sports drink for athletes who intentionally want to restrict their carbohydrate intake.

By using a double dose (2 sachets) the 6d HYDRO becomes a typical “Oral Rehydration Solution” (ORS). The 6d ORS is the ideal solution for athletes who not only sweat a lot, but also sweat out lots of salts. This high salt drink is mostly used in hot and / or humid conditions both before and during exercise, but primarily after exercise.


One of the most important aspects of optimal performance is keeping athletes healthy. Our health category generally includes products that help to correct diagnosed nutrient deficiencies such as our 6d VITAMIN D3 DROPS. Also products that can treat clinical issues such as our 6d COLLAGEN PEPTAN are found in our health category. While we provide science-based recommendations, it is still recommended to use these products in supervision by a sports medicine/science practitioner.


Vitamine D3 Drops

Sunlight is the most important source of vitamin D. In addition, dietary intake of vitamin D is often insufficient to prevent a deficiency, especially when there is inadequate exposure to UV radiation from the sun. 6d VITAMIN D3 DROPS is the ideal vitamin D supplement for athletes with insufficient sun exposure. One drop contains an exceptionally high dose of 1000 IU of vitamin D3, while the dropper allows a precise dosage.

Vitamin D contributes to the maintenance of normal bones and muscle functioning and contributes to the normal functioning of the immune system.



Regular consumption of fatty fish, 1 to 2 servings per week, is recommended by international health authorities to support general health. This recommendation corresponds to a daily average intake of 250-500 mg eicosapentaenoic acid (EPA) + docosahexaenoic acid (DHA). However, not everyone likes to eat fish, and this also applies to athletes.

6d OMEGA-3 is the ideal supplement for all athletic people that are not able to meet this recommendation, due to the exceptionally high dosage of EPA (500 mg) and DHA (250 mg) per softgel.


Collagen Peptan®

Musculoskeletal injuries, such as injuries to skeletal muscles, tendons, ligaments, bones and cartilage, are the most common injuries seen in both recreational and elite athletes, and certainly in “contact sports” such as football.

During the rehabilitation process, the production of collagen in these musculoskeletal tissues is stimulated by exercise. This requires the availability of certain specific amino acids, namely L-proline, L-lysine, L-hydroxyslysine and L-hydroxyproline, which are highly present in type-1 collagen peptides such as PEPTAN®. Vitamin C also contributes to normal collagen formation.

6d COLLAGEN PEPTAN® is the ideal supplement for all athletes who want to strengthen their bones, cartilage, tendons and/or ligaments. Also, athletes who want to speed up their rehabilitation process after a sports injury can make use of the 6d COLLAGEN PEPTAN®.


Next to strength training and sufficient energy intake, protein is the main nutrient responsible for gaining muscle mass, strength and power. Also during a low-calorie diet to lose weight, protein contributes to the maintenance of muscle mass and power. Therefore, this category will include all our high-quality protein products in a variety of tasty flavors. Also creatine monohydrate, which is a known supplement that can boost explosive strength and power, is found in this category.


Whey Protein

To limit the loss of muscle mass, and to maximize muscle protein synthesis, it is important that sufficient protein is taken after strength training.

6d WHEY PROTEIN only consists of premium-quality whey protein isolate. One serving contains 29g fast-absorbing protein and 3 g L-leucine, which is naturally present in the whey. This combination maximizes the synthesis of new muscle proteins in the body. Moreover, this shake is low in carbohydrates and fat. As a result, the 6d WHEY PROTEIN is the ideal shake for athletes that do strength training, but also athletes that (should) restrict their carbohydrate intake can use this drink.


Night Protein

While 20 to 40g of protein maximizes muscle protein synthesis during the day, there are strong indications that an intake of at least 40g of protein is needed before bedtime. Preferably slow-absorbing protein such as micellar casein. This with the aim to optimize muscle building and recovery during the night.

6d NIGHT PROTEIN only consists of premium quality micellar casein isolate with an exceptionally high casein:whey ratio (95:5). As a result, one dose contains a whopping 38g of slow- and only 2g of fast-absorbing protein. The ideal pre-bed protein shake. In addition, 6d NIGHT PROTEIN is low in carbohydrates and fat, and high in calcium.


Creatine Creapure®

Long-term intake of creatine can improve performance during short, all-out exercise, and especially when these sessions are performed in an interval fashion. So, ingesting creatine is sensible to boost performance in explosive sports, “start and stop” sports, but also during endurance exercise. Moreover, the intake of creatine in combination with intensive strength training can increase muscle strength and muscle mass.

6d CREATINE CREAPURE® only consists of 100% ultra-pure creatine monohydrate (Creapure®) and is thus extremely suitable for athletes that want to increase their muscle strength, muscle mass, speed, and/or explosiveness. Athletes with a sports injury who want to speed up the rehabilitation process can also take advantage of 6d CREATINE CREAPURE®.


Depletion of carbohydrate stores in the body and dehydration are the two main causes of fatigue in (endurance) exercise. At 6d sports nutrition we try to provide athletes with practical fueling and hydration products with a science-based composition. Our endurance category therefore includes different sports drinks, energy gels, isogels and energy bars in variety of tasty flavors. Also our L-carnitine supplement, which can aid your endurance, is found in this category.


L-Carnitine Carnipure®

Fats are an important fuel source for the muscles during prolonged endurance exercise of light to moderate intensity. Long-term ingestion of L-carnitine tartrate (Carnipure®) in combination with carbohydrates will increase muscle L-carnitine stores. This stimulates the use of fats during light to moderate intensity, preserves energy (glycogen) for in the final stage of a competition, and can therefore improve performance during prolonged endurance exercise.

6d L-CARNITINE CARNIPURE® contains 1,000 mg of ultra pure Carnipure® per capsule. However, this supplement is only of interest to (ultra) endurance athletes given that the effects of L-carnitine are only seen during prolonged endurance exercise of a light to moderate intensity.


Isotonic Sports Drink

Depletion of carbohydrate stores in the body and dehydration are the two main causes of fatigue in (endurance) exercise. Because (endurance) athletes often take too much or too little carbohydrates, and often in the wrong concentration, the absorption of carbohydrates and fluid is not always optimal.

The 6d ISOTONIC SPORTS DRINK contains ±30g of carbohydrates in a 2:1 glucose to fructose ratio. Thanks to this 2:1 ratio the body can use up to 90g of carbohydrates per hour during exercise. Despite its 450mg of sodium per 500 ml, this sports drink is still perfectly isotonic, which ensures the optimal absorption of both water and energy (sugars) simultaneously.



Often athletes forget to drink enough water when taking energy gels. This creates a mixture in the stomach with a high carbohydrate concentration and a very high osmolality. This slows down the emptying of the stomach and consequently the rate of absorption, with most likely gastrointestinal complaints as a result.

The 6d ISOGEL contains only 20g of carbohydrates from a carefully selected form of maltodextrin. As a result, the 6d ISOGEL is already isotonic by itself. This allows for a faster absorption than most other gels. In short, this gel is the ideal choice for athletes who cannot/do not want to consume water at the same time and/or during (intensive) exercise with a shorter duration (1-2 hours).


Energy Sports Drink

When the need for energy is greater than the need for fluids (e.g. in cold environment), or in situations where the opportunities to supply energy are scarce (e.g. in team sports), there is a risk for insufficient fueling.

The 6d ENERGY SPORTS DRINK is a high carbohydrate sports drink with an acceptable osmolality (<390 mOsm/kg). As a result, this sports drink is better tolerated during exercise than most other energy drinks. The 6d ENERGY SPORTS DRINK can also be used as a “carbo loader” to increase the energy reserves in the body, both before and after exercise.


Energy Gel

Carbohydrates are the most important energy source during intensive exercise. Due to the body’s limited storage capacity for carbohydrates, it is recommended to provide carbohydrates via the diet during (intensive) exercise of 60 minutes or longer.

The 6d ENERGY GEL contains 30g of carbohydrates in a 2:1 glucose to fructose ratio. Thanks to this 2:1 ratio the body can use up to 90g of carbohydrates per hour during exercise. In contrast to most other gels, this gel also contains 200mg of sodium. In short, the 6d ENERGY GEL is the ideal choice during prolonged endurance exercise (≥2 hours), especially in a hot and/or humid environment.


Energy Cake

Next to the right sports drink also energy bars are often crucial for a quick and easily digestible energy supply during (endurance) exercise. Bars high in protein, fat and fiber slow down gastric emptying, and consequently the rate of absorption of the desired energy source (carbohydrates). Moreover, such bars are often the cause of a “full” feeling and gastrointestinal complaints.

The 6d ENERGY CAKE is an easily digestible, carbohydrate-rich “cake” that ensures fast energy supply. One serving contains 31g of carbohydrates in a 2:1 glucose to fructose ratio. Thanks to this 2:1 ratio the body can use up to 90g of carbohydrates per hour. In contrast to most other bars, this cake also contains 141 mg of sodium. Therefore, this “cake” is a great choice in a hot and/or humid environment.