Douglas Laboratories Klean Endurance

by Douglas Laboratories

Douglas Labs Klean Endurance chewable tablets contain pure, all natural D-Ribose that supports the natural way a body produces adenosine triphosphate (ATP). 

The natural pentose sugar supports cardiovascular health, energy production, and mitochondrial function.

Klean Endurance offers a clinically proven way to help restore energy during exercise. 


Serving size 2 Chewable Tablet

Amount Per Serving %DV


Total Carbohydrates..........2g.........<2%†


Sugar Alcohol..........0.5g........*


*Daily Value not established.

*Percent Daily Value are based on a 2000 calories diet.

Other Ingredients:

Xylitol,cellulose,hydroxypropylcellulose, natural orange and vanila flavors, critric acid mannitol,vegetable stearate acid,natural palm wax (Copemicia prunifera),and silica.

Suggested Use:

Take 1-3 chewable tablets just before (within 15-30 minutes), during activity (1-3 chews every 60 minutes) and just after physical activity. Best taken with a food or a sugar/glucose source to prevent low blood sugar from occurring.


Mild, transient hypoglycemia may occur if taken on an empty stomach. Insulin-dependent diabetics and pregnant women should consult their physician before use. Although D-ribose is a pentose sugar, it does not raise blood sugar levels. D-ribose is rapidly and readily (~95%) absorbed with peak blood levels found within 30 – 45 minutes after ingestion.


Store in a cool, dry place, away from direct light. Keep out of reach of children.

Side Effects:

No adverse effects have been reported.

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

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