Bilberry for Athletes: Performance Evidence

Bilberry for Athletes: What the Evidence Shows

Bilberry (Vaccinium myrtillus) is a dark-blue wild berry native to Northern and Central Europe. Unlike common blueberry cultivars, bilberry has a deep pigmentation throughout its flesh — a sign of exceptionally high anthocyanin content. Athletes have started paying attention to bilberry for athletes because of two plausible benefits: reduced oxidative stress after exercise and improved low-light visual acuity.

How Bilberry Works in the Context of Sport

Anthocyanins and Oxidative Stress

Intense training generates reactive oxygen species that can damage muscle tissue and slow recovery. Anthocyanins — the polyphenols that give bilberry its colour — act as antioxidants and may modulate inflammation pathways. Sporadic research on berry polyphenols suggests they may reduce markers of muscle damage after eccentric exercise (Howatson et al., 2010). Bilberry is among the richest dietary sources of anthocyanins per gram.

Visual Performance

Anthocyanins bind to rhodopsin, the photopigment in rod cells, and may improve the regeneration rate of visual purple in the retina. This is relevant for sports played in variable lighting conditions — night cycling, shooting sports, or indoor arenas. A double-blind crossover study found that bilberry extract supplementation was associated with improved low-luminance contrast sensitivity compared with placebo (Nakaishi et al., 2000). This is one of the more robust findings in the bilberry literature.

Capillary Integrity

Bilberry anthocyanins may strengthen capillary walls by stabilising collagen cross-links. Healthy capillaries support blood delivery to working muscles and efficient waste removal — both important for endurance performance.

Strength and Endurance Evidence

Direct evidence in trained athletes is limited. The strongest data come from berry polyphenol interventions more broadly. A randomised trial using New Zealand blackcurrant extract — anthocyanin-rich like bilberry — showed improvements in blood flow during cycling (Cook et al., 2015). Whether bilberry extract produces identical effects remains to be confirmed in dedicated trials.

For recovery, berry anthocyanins appear to reduce perceived soreness and creatine kinase levels after intense exercise (Bell et al., 2014), though most trials use cherry or blueberry rather than bilberry specifically. Extrapolating these findings to bilberry is reasonable given similar anthocyanin profiles, but it should be done cautiously.

Effective Protocol

No standardised dosing exists for sport-specific bilberry use. Studies on visual endpoints have used doses ranging from 80 mg to 160 mg of standardised bilberry extract (typically 36% anthocyanins) daily. For recovery purposes, consumption as whole berries or an equivalent extract starting 48 hours before an intense event or training block is a common practical approach.

• Form: Standardised extract (36% anthocyanins) or whole dried/frozen berries.
• Timing: Daily use for several weeks rather than acute pre-event loading seems most evidence-aligned.
• Stacking: Pairs well with vitamin C, which may preserve anthocyanin bioavailability.

Bilberries are available fresh and dried at health stores and online, including at maxfit.ee.

Who Benefits Most

Honest Verdict

Bilberry is a low-risk, food-based supplement with real but modest sport-relevant evidence. The visual acuity benefit has the clearest direct data. Recovery support is plausible but currently reliant on studies with other berries. Anyone who enjoys berries as part of a healthy diet is probably already capturing most of the benefit. Dedicated supplementation with a standardised extract makes most sense for precision-sport athletes or those doing prolonged training blocks where cumulative oxidative stress is high.

References

1. Howatson, G., McHugh, M. P., Hill, J. A., Brouner, J., Jewell, A. P., van Someren, K. A., Shave, R. E., & Howatson, S. A. (2010). Influence of tart cherry juice on indices of recovery following marathon running. Scandinavian Journal of Medicine & Science in Sports, 20(6), 843–852. https://pubmed.ncbi.nlm.nih.gov/19883392/
2. Nakaishi, H., Matsumoto, H., Tominaga, S., & Hirayama, M. (2000). Effects of black currant anthocyanoside intake on dark adaptation and VDT work-induced transient refractive alteration in healthy humans. Alternative Medicine Review, 5(6), 553–562. https://pubmed.ncbi.nlm.nih.gov/11134978/
3. Cook, M. D., Myers, S. D., Blacker, S. D., & Willems, M. E. (2015). New Zealand blackcurrant extract improves high-intensity cycling performance. European Journal of Applied Physiology, 115(11), 2357–2365. https://pubmed.ncbi.nlm.nih.gov/26175097/
4. Bell, P. G., Walshe, I. H., Davison, G. W., Stevenson, E., & Howatson, G. (2014). Montmorency cherries reduce the oxidative stress and inflammatory responses to repeated days high-intensity stochastic cycling. Nutrients, 6(2), 829–843. https://pubmed.ncbi.nlm.nih.gov/24566440/

FAQ

Is bilberry the same as blueberry?

No. Bilberry (Vaccinium myrtillus) is a smaller, wild berry native to Europe with purple flesh throughout, indicating higher anthocyanin density. Common blueberries (V. corymbosum) are cultivated, larger, and have white or pale flesh inside. The anthocyanin profile differs and bilberry is generally considered the more potent of the two per gram.

When should an athlete take bilberry extract?

Daily consistent use over several weeks is more aligned with current evidence than acute dosing. For visual benefits, trials have used 8–12 weeks of daily supplementation. For recovery support around a training block, beginning supplementation a few days before the most demanding sessions may be practical.

Is bilberry safe for athletes subject to anti-doping testing?

Bilberry is a natural food ingredient with no known prohibited substances. It does not appear on the WADA prohibited list. As always, athletes in tested sports should choose products from suppliers with batch-testing certification to minimise contamination risk.