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    A one-dose wonder! New study shows high acute intake of CurraNZ improves performance in weekend warriors

    on July 18, 2023

    Scientist: 'The response is dependent on level of fitness'


    CurraNZ been shown in recent years to be a reliable and effective performance enhancer in cyclists and runners after repeated intake.

    A new study1 has revealed that one three-capsule (900mg) dose of CurraNZ® two hours before exercise can deliver a modest but worthwhile performance effect in adults with lower levels of fitness.

    Plus, data showed an emerging gender-specific performance trend that researchers have been observing across CurraNZ data sets.

    Researchers from the University of Chichester tested 26 endurance-trained males and eight females in a high-intensity, 10-mile cycling time trial using SWIFT cycling software.

    Two hours after taking one dose of 900mg of the CurraNZ® supplement, cyclists were measured on time, power, speed, heart rate, cadence and reported perceived exertion.

    Initial analysis of group effects showed no performance outcomes, but when researchers separated the results of faster (TT < 1400 seconds) and slower riders (TT > 1400seconds), data showed:

    • 11 of the 17 slower cyclists (65%) had a higher speed and power profile across the whole time trial
    • Responders finished the time trial on average 20 seconds faster
    • 63% of females and 35% of the males had an improvement of >0.6% up to 6%
    • Performance improvements were close to significance at 8km
    • Power output and speed were significantly higher at 12km 

    Mark Willems, Professor of Exercise Physiology at the University of Chichester (pictured, left), led the study, saying: “The main message from this study is that not everyone responds to one dose of blackcurrant, it’s dependent on their level of fitness.

    “Interestingly, we also observed that the beneficial effect seems to emerge in the latter part of the time trial, the part where it is likely that negating effects of fatigue are kicking in.

    “Those who ride a time trial of 23 minutes or less would benefit using this dosing rationale with blackcurrant. It also appears that females may be a bit more responsive and is a trend we’re starting to see across our studies, although more work needs to be done to confirm this.”

     The smallest worthwhile change in 10-mile elite time trial cycling is considered to be 0.6%2. A previous study3 of seven-day dosing on CurraNZ blackcurrant extract showed cyclists improved their performance by on average 2.4% up to 8.6%. 

    Professor Willems says: “Some people can respond highly but for those who are high-ability cyclists, they will probably need to dose for a longer period in order to benefit from the performance effects of blackcurrant.

    “This finding is great for the slower weekend warrior though and hopefully it will lead to follow-on studies.”


    1. Acute Effects of New Zealand Blackcurrant Extract on Cycling Time-Trial Are Performance Dependent in Endurance-Trained Cyclists: A Home-Based Study, April 2023, Sports, S Montanari, S Blacker, MET Willems. Sports 2023, 11, 93.

    2. Variation in performance of elite cyclists from race to race, March 2006, C P.aton, W Hopkins, Eur Jour Sports Science,DOI: 10.1080/17461390500422796

    3: New Zealand Blackcurrant Improves Performance and Fat Oxidation in Cyclists, Willems ME1, Myers SD, Blacker S, Cook MD. European Journal of Applied Physiology, 2015 June 30. DOI 10.1007/s00421-015-3215-8