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During WWII, British Air Force pilots were given bilberry jelly to help improve their night vision and strengthen tired eyes. Bilberries contain anthocyanosides which have shown to enhance the photosensitivity of the eyes and help them adapt to variations in light intensity. This is found to be especially beneficial for night vision.

STRIX has been tested by the Swedish National Board of Health and is registered as a natural product (No. 87-5016)