Home Ingredients Cran-Gyn PRO® (Cranberry Urinary Blend — Valensa International)
Kidney/Urinary TractWomen's Health

Cran-Gyn PRO® (Cranberry Urinary Blend — Valensa International)

Vaccinium macrocarpon
Evidence Level
Limited
2 Clinical Trials
3 Documented Benefits
2/5 Evidence Score

Cran-Gyn PRO® belongs to Valensa International's Cran-Gyn line of cranberry ingredients for urinary tract and feminine health. Supplement labels that use Valensa's Cran-Gyn blend list D-mannose, cranberry juice concentrate, magnesium hydroxide and tricalcium phosphate, without giving the amount of each or the proanthocyanidin (PAC) content. No trial of Cran-Gyn PRO itself is cited here, so the evidence on this page comes from its main ingredients. Pooled cranberry trials showed fewer repeat urinary infections in women who get them often. For D-mannose, the largest placebo-controlled trial, in 598 women, found no benefit, and the trial dose (2 g a day) is far more than a small blend can supply. It is not a treatment for an active infection; that needs a doctor.

Studied Dose No dose of this blend has been tested in a trial. One label lists 250 mg of the Cran-Gyn blend per daily caplet, while the D-mannose trials used 2 g a day.
Active Compound A proprietary blend. Labels using Valensa's Cran-Gyn list D-mannose, cranberry (Vaccinium macrocarpon) juice concentrate, magnesium hydroxide and tricalcium phosphate; PAC content is not disclosed.

Benefits

Urinary tract health

Cranberry products have been tested in dozens of trials. Pooled results showed fewer repeat urinary infections in women who get them often, in children and after some medical procedures, but showed little effect in older adults in care homes or in pregnancy. No trial has tested this blend, and its PAC content is not disclosed.

Supported by Trial 1

D-mannose content

The blend includes D-mannose, a simple sugar also sold on its own for urinary health. In a double-blind trial in 598 women with frequent infections, 2 g a day for 6 months did not reduce doctor-attended infections compared with placebo (51.0% vs 55.7%, not a significant difference).

Supported by Trial 2

Anti-adhesion action

Cranberry proanthocyanidins (PACs) inhibit the attachment of P-fimbriated E. coli to cells lining the bladder in lab studies. This is the leading proposed mechanism; whether this blend delivers enough PACs to do so in people has not been tested.

Supported by Trial 1

Mechanism of action

1

Proanthocyanidins (PACs)

Cranberry PACs inhibit the adherence of P-fimbriated E. coli to the cells lining the bladder in lab studies, so fewer bacteria may attach. PAC content varies between cranberry products and is not disclosed for this blend, and pooled trials could not show a difference between low and high PAC doses.

Clinical trials

1
Cranberry products for urinary tract health: Cochrane review (not a study of this product)
PubMed

Cochrane systematic review of randomized and quasi-randomized trials of cranberry juice, tablets or capsules versus placebo, no treatment or other options, searched to March 2023. (Williams et al. 2023, Cochrane Database Syst Rev)

50 trials with 8,857 participants, including women with recurrent infections, children, older adults in care, pregnant women and people after medical procedures.

Cranberry products reduced symptomatic, culture-verified infections overall (RR 0.70, 95% CI 0.58 to 0.84) and in women with recurrent infections (8 trials, 1,555 people, RR 0.74, 95% CI 0.55 to 0.99). There was little or no benefit in elderly institutionalized people or pregnant women. Effects of different PAC doses were unclear. Gastrointestinal side effects probably did not differ from placebo.

2
D-mannose vs placebo in women with frequent infections: double-blind trial (not a study of this product)
PubMed

Double-blind randomized placebo-controlled trial of 2 g D-mannose powder daily for 6 months across 99 UK primary care centers. (Hayward et al. 2024, JAMA Intern Med)

598 women aged 18 or older (mean age 58) with at least 2 infections in 6 months or 3 in 12 months; 303 on D-mannose, 295 on placebo.

The primary outcome was not met: 51.0% on D-mannose and 55.7% on placebo had a doctor-attended suspected infection (risk difference -5%, 95% CI -13% to 3%, p=0.26). No secondary outcome differed. The authors concluded D-mannose should not be recommended for prevention in this group.

Side effects and drug interactions

Common Potential side effects

In pooled cranberry trials, gastrointestinal side effects were probably no more common than with placebo or no treatment.
Very large amounts of cranberry can cause stomach upset and diarrhea, particularly in young children.
No tolerability data for this branded blend are cited here.

Important Drug interactions

Warfarin: evidence on an interaction with cranberry is conflicting. Tell your prescriber and monitor INR if you combine them.
Not a substitute for antibiotics during an active infection.
Tell your doctor about a history of kidney stones.

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Frequently asked questions about Cran-Gyn PRO® (Cranberry Urinary Blend — Valensa International)

What is Cran-Gyn PRO?

Cran-Gyn PRO® belongs to Valensa International's Cran-Gyn line of cranberry ingredients for urinary tract and feminine health. Supplement labels that use Valensa's Cran-Gyn blend list D-mannose, cranberry juice concentrate, magnesium hydroxide and tricalcium phosphate, without giving the amount of each or the proanthoc…

What is Cran-Gyn PRO used for?

Cran-Gyn PRO is researched primarily for Kidney/Urinary Tract and Women's Health. Cranberry products have been tested in dozens of trials. Pooled results showed fewer repeat urinary infections in women who get them often, in children and after some medical procedures, but showed little effect in older adults in care home…

What is the recommended dosage of Cran-Gyn PRO?

No dose of this blend has been tested in a trial. One label lists 250 mg of the Cran-Gyn blend per daily caplet, while the D-mannose trials used 2 g a day. Always follow the product label and check with a healthcare provider for personal advice.

Is Cran-Gyn PRO safe, and does it have side effects?

Side effects and cautions reported for Cran-Gyn PRO include: In pooled cranberry trials, gastrointestinal side effects were probably no more common than with placebo or no treatment. Very large amounts of cranberry can cause stomach upset and diarrhea, particularly in young children. It may also interact with some medications. Cran-Gyn PRO is not right for everyone, so check with a healthcare provider first if you are pregnant or breastfeeding, have a medical condition, or take prescription medication.

Does Cran-Gyn PRO interact with any medications?

Possible interactions include: Warfarin: evidence on an interaction with cranberry is conflicting. Tell your prescriber and monitor INR if you combine them. Not a substitute for antibiotics during an active infection. If you take prescription medication, check with a pharmacist or doctor before using it.

How strong is the scientific evidence for Cran-Gyn PRO?

NutraSmarts rates the evidence for Cran-Gyn PRO as Limited (2 out of 5). It is backed by 2 study summaries and 5 cited references summarized on this page. A higher rating reflects more, larger, and better-designed human studies.

References(5 citations)

Evidence ratings on NutraSmarts are based on the totality of human clinical research, with emphasis on randomized controlled trials, meta-analyses, and systematic reviews. The references below directly support claims made throughout this page.

  1. Williams G, Stothart CI, Hahn D, Stephens JH, Craig JC, Hodson EM. Cranberries for preventing urinary tract infections. Cochrane Database Syst Rev. 2023;11(11):CD001321. doi: 10.1002/14651858.CD001321.pub7.PubMedUsed to support: Cochrane review of 50 trials (8,857 participants) of cranberry products, not of this branded ingredient. Cranberry reduced symptomatic, culture-verified urinary tract infections overall (RR 0.70, moderate certainty), including in women with recurrent infections (RR 0.74), children and people after medical interventions, but showed little or no benefit in elderly institutionalized people, pregnant women or people with bladder emptying problems. No difference was shown between low, moderate and high PAC doses.
  2. Hayward G, Mort S, Hay AD, Moore M, Thomas NPB, Cook J, Robinson J, Williams N, Maeder N, Edeson R, Franssen M, Grabey J, Glogowska M, Yang Y, Allen J, Butler CC. d-Mannose for Prevention of Recurrent Urinary Tract Infection Among Women: A Randomized Clinical Trial. JAMA Intern Med. 2024;184(6):619-628. doi: 10.1001/jamainternmed.2024.0264.PubMedUsed to support: Double-blind placebo-controlled trial in 598 women with recurrent urinary tract infections in UK primary care: 2 g/day D-mannose for 6 months did not reduce doctor-attended suspected infections (51.0% vs 55.7%, p=0.26); not a study of this blend.
  3. Santer M, Miller S, Fraser S, Francis N, Lown M, Becque T, Tenters F, Hanna L, Muller I. Non-antibiotic interventions to prevent recurrent urinary tract infections in women: overview of systematic reviews of randomised controlled trials. Br J Gen Pract. 2026;BJGP.2026.0055. doi: 10.3399/BJGP.2026.0055. Online ahead of print..PubMedUsed to support: Overview of 27 systematic reviews of non-antibiotic ways to prevent recurrent urinary tract infections in women aged 16 or over: cranberry was among the options supported by reviews, with open questions on dose, duration and adherence, while reviews of D-mannose concluded stronger evidence is needed. Not a study of this blend.
  4. Indiana Botanic Gardens. UT Complete (Botanic Choice): Supplement Facts label. NIH Office of Dietary Supplements, Dietary Supplement Label Database. ;DSLD label 77915..SourceUsed to support: Not PubMed-indexed; a product label. It lists a 250 mg Cran-Gyn proprietary blend per caplet containing D-mannose, cranberry juice concentrate, magnesium hydroxide and tricalcium phosphate, and describes Cran-Gyn as a formulation of Valensa International. Amounts of each component and PAC content are not given.
  5. National Center for Complementary and Integrative Health. Cranberry. NCCIH, National Institutes of Health. 2024;Last updated November 2024..SourceUsed to support: Not PubMed-indexed; NIH fact sheet. Cranberry can cause stomach upset and diarrhea when taken in very large amounts, particularly in young children; evidence on a warfarin interaction is conflicting; cranberry is not recommended as a treatment for an existing urinary tract infection.