Benefits
Supports low-light vision and dark adaptation
Blackcurrant anthocyanins are traditionally used to support the eye's ability to adjust to dim light. In healthy adults, a single dose lowered the dark-adaptation threshold in a dose-dependent way, suggesting help for the eyes when moving into low-light settings.
Helps ease screen-related eye fatigue
Long hours at a computer or phone can leave eyes tired and strained. Blackcurrant anthocyanins have been studied for helping maintain focusing comfort and reducing transient refractive shifts after intensive visual display terminal work, supporting everyday eye comfort.
Promotes healthy circulation
Anthocyanins from blackcurrant may help support blood flow. Human work has shown increased peripheral muscle circulation and effects on ocular blood flow, which supports delivery of oxygen and nutrients to hard-working tissues like the eyes and muscles.
Provides antioxidant support
Blackcurrant anthocyanins are potent plant antioxidants that help neutralize free radicals and support the body's own defenses against everyday oxidative stress, a key part of maintaining healthy aging and cellular resilience.
Mechanism of action
Rhodopsin regeneration in the retina
Cyanidin-based anthocyanins from blackcurrant have been shown to accelerate the regeneration of rhodopsin, the light-sensitive pigment in retinal rod cells. Faster rhodopsin turnover is thought to underlie improvements in dark adaptation and low-light visual function.
Ciliary muscle relaxation and focusing
Delphinidin-3-rutinoside, a major blackcurrant anthocyanin, relaxes ciliary smooth muscle in laboratory models. Because the ciliary muscle controls the lens's focusing power, this relaxation is a proposed mechanism for reduced eye strain during sustained near work.
Vasomodulation and blood flow
Anthocyanins influence vascular tone, in part via nitric oxide and endothelin-1 signaling. Blackcurrant intake has been associated with increased peripheral and ocular blood flow and with normalization of elevated endothelin-1, supporting microcirculation.
Free-radical scavenging
The polyphenolic structure of anthocyanins donates electrons to quench reactive oxygen species and supports endogenous antioxidant enzyme activity, reducing oxidative burden on cells and tissues.
Clinical trials
Double-blind, placebo-controlled crossover trial of blackcurrant anthocyanosides at 12.5, 20 and 50 mg (Nakaishi et al., 2000, Alternative Medicine Review). Component/class evidence on blackcurrant anthocyanins, not on the finished VitaCurrant product.
Healthy adult volunteers
Blackcurrant anthocyanoside intake produced a dose-dependent lowering of the dark-adaptation threshold, significant at 50 mg, and blunted the transient refractive shift seen after intensive video-display-terminal work versus placebo. Small, short-term study.
Placebo-controlled, double-masked crossover study, blackcurrant anthocyanins 50 mg/day for 4 weeks (Ohguro, Ohguro & Yagi, 2013, Journal of Ocular Pharmacology and Therapeutics). Component/class evidence on blackcurrant anthocyanins, not the finished VitaCurrant product.
12 healthy volunteers and 21 glaucoma patients on standard therapy
Oral blackcurrant anthocyanins were associated with a modest reduction in intraocular pressure in both healthy subjects and treated glaucoma patients. Small pilot-scale study; not a substitute for glaucoma medication.
Randomized, placebo-controlled, double-masked trial, blackcurrant anthocyanins 50 mg/day for 24 months (Ohguro et al., 2012, Ophthalmologica). Component/class evidence, not on the finished VitaCurrant product.
38 patients with open-angle glaucoma on treatment
Over two years, the anthocyanin group showed slower visual-field deterioration and better ocular blood flow than placebo. Encouraging but small; conducted alongside conventional care.
Double-blind, placebo-controlled crossover study, blackcurrant anthocyanin ~17 mg/kg body weight (Matsumoto et al., 2005, European Journal of Applied Physiology). Component/class evidence on blackcurrant anthocyanins, not the finished VitaCurrant product.
Healthy young men
Acute blackcurrant anthocyanin intake increased forearm blood flow about 2 hours after ingestion and was associated with reduced typing-related muscle stiffness, supporting a peripheral circulation effect. Very small sample.