Do Probiotics Have An Effect On Libido?

What the research shows

Several high-quality randomized controlled trials (RCTs) provide evidence that probiotics can improve sexual function and libido-related outcomes in targeted populations. In women with depressive disorder treated with SSRIs, a probiotic mixture including Bifidobacterium bifidum and Lactobacillus species improved sexual function (FSFI scores), sexual satisfaction, and reduced depression severity (PMID: 38216917). A similar RCT in men with mild to moderate depression on SSRIs showed that Lactofem (a probiotic mixture) combined with Escitalopram improved erectile function, sexual desire, orgasmic function, and overall sexual satisfaction compared to Escitalopram alone (PMID: 42059569). In women with PCOS, probiotic supplementation alongside letrozole improved sexual function scores and pregnancy rates (PMID: 36096842). Postmenopausal women receiving Lactobacillus acidophilus showed improved sexual function and menopause-related quality of life (PMID: 41326645). Another RCT in postmenopausal women reported that probiotic supplementation improved fatigue severity and sexual function (PMID: 41186601). Additionally, a probiotic Lactiplantibacillus plantarum strain improved sexual health domains related to mood and anxiety in healthy women (PMID: 40008414). These studies highlight strain-specific and condition-specific benefits rather than generalizable effects. Other studies on probiotics and the gut-brain axis suggest potential mechanisms involving neurotransmitter modulation, immune regulation, and hormonal effects, but direct evidence on libido is limited. Systematic reviews and meta-analyses on probiotics and appetite or eating behavior show mixed results and do not directly address libido. Overall, the evidence supports that probiotics may improve sexual function and libido-related outcomes in populations with depression, hormonal imbalances, or menopausal symptoms, but evidence in healthy populations or for general libido enhancement is lacking.

Best studied probiotic strains

Who may benefit

Safety

The probiotic interventions reported in the high-quality RCTs were generally well tolerated with no serious adverse events reported. For example, the SB-121 probiotic formulation containing Limosilactobacillus reuteri was safe and well tolerated in autistic participants (PMID: 36997569). No significant safety concerns were noted in studies involving Lactobacillus acidophilus, Bifidobacterium bifidum, or Lactiplantibacillus plantarum. However, long-term safety data and studies in broader populations are limited.

Limitations

Evidence is largely limited to specific populations such as individuals with depression on SSRIs, women with PCOS, and menopausal women; generalizability to healthy populations or other conditions is unclear. Strain-specific effects are important, and many studies used probiotic mixtures without isolating individual strain effects. Sample sizes vary, and some studies lack placebo controls or long-term follow-up. Cultural and demographic homogeneity in some trials limits applicability to diverse populations. Mechanistic understanding remains incomplete, and more large-scale, well-controlled trials are needed to confirm findings and establish optimal strains, dosages, and treatment durations.

PubMed sources