Most probiotics — including most products marketed to women — use gut strains. Lactobacillus acidophilus, Lactobacillus rhamnosus: these are well-studied for digestive health, but they are not the strains that dominate a healthy vaginal microbiome. Vitamoon uses six strains validated specifically for vaginal health — including L. crispatus, which is the dominant strain in a healthy vaginal microbiome and one of the hardest strains to find in any supplement. We also include an XOS prebiotic that selectively feeds Lactobacillus strains, giving the good bacteria a competitive advantage. Most vaginal probiotics skip both.*

Lactobacillus crispatus is the dominant strain found in a healthy vaginal microbiome. Unlike the gut, which thrives on microbial diversity, a healthy vaginal environment is dominated by a small number of Lactobacillus species — primarily L. crispatus. These strains produce lactic acid, maintain a low pH (3.8–4.5), and crowd out the bacteria associated with BV, odor, and pH disruption. L. crispatus is the most studied strain for vaginal health and the hardest to source — which is why most vaginal probiotics don't include it. Vitamoon does.*

Everyone's microbiome is different, and timelines vary. Some women notice changes within the first two to four weeks — less odor, more consistent discharge, a sense of balance. For others, particularly those with a history of recurring BV or antibiotic use, it can take six to eight weeks of consistent use for the microbiome to fully shift. The key word is consistent: two capsules, once a day, every day. Probiotic bacteria need time to establish and compete. Don't stop early.*

Yes. Antibiotics are one of the most common triggers for vaginal flora disruption — they eliminate the bacteria responsible for BV, but they also eliminate the Lactobacillus strains that keep things balanced. Starting this formula during or immediately after an antibiotic course can help support the re-establishment of Lactobacillus in the vaginal environment. If taking both simultaneously, space them a few hours apart when possible. Let your doctor know what you're taking.*

This formula is designed to support a healthy vaginal microbiome and help maintain vaginal pH balance — the underlying environment that, when disrupted, is associated with BV, odor, and discharge changes. It is not a treatment for an active infection. If you have symptoms of BV right now — strong odor, unusual discharge, itching — see a doctor. This product supports the conditions that help keep those symptoms from returning. It works at the level of prevention and maintenance, not acute treatment.*

XOS stands for xylo-oligosaccharides — a prebiotic fiber that selectively feeds Lactobacillus bacteria. Most prebiotics feed a broad range of probiotic bacteria. XOS is more specific: research shows it preferentially promotes the growth of Lactobacillus strains over other bacteria. In the context of a vaginal probiotic, this matters because you want to give the Lactobacillus strains a competitive advantage. 600mg of XOS per serving is included for exactly that reason.*

This formula is generally very well tolerated. Some women experience mild digestive adjustment in the first week — minor bloating or a change in bowel habits — as the probiotic bacteria begin to establish. This typically resolves on its own. The formula contains no artificial fillers, uses a vegetable capsule, and is gluten-free and non-GMO. If you have a compromised immune system or are taking immunosuppressant medications, consult your doctor before starting any probiotic supplement.

Yes. The capsules are vegetable-based, not gelatin. The formula contains no gluten, no animal-derived ingredients, and no artificial fillers. It is also non-GMO. The full ingredient list is on the label and the Certificate of Analysis is published at vitamoon.com.