InfoSynergy
Iron
L. plantarum 299v may improve absorption of non-heme iron from some fortified foods.
Recommendation: Can be taken with iron-containing meals, but continue appropriate iron monitoring if deficient.
Lactobacillus plantarum 299v
Probiotic ·Moderate evidence ·Reviewed May 2026
Lactobacillus plantarum 299v, now classified as Lactiplantibacillus plantarum 299v, is a strain-specific probiotic studied for IBS symptoms such as abdominal pain, bloating, and gas. It has also been studied for improving non-heme iron absorption when added to iron-containing foods. Benefits should not be generalized to all Lactobacillus products because probiotic effects are strain-specific.
What it's good for
What to watch for
- Temporary gas, bloating, or stool changes
- Mild abdominal discomfort during initiation
- Rare infection risk in severely immunocompromised or critically ill people
- Severe immunocompromise, neutropenia, central venous catheter, or critical illness without clinician supervision
- Short bowel syndrome or severe D-lactic acidosis history without specialist input1,2
The bottom line
Evidence rating moderate. Most-documented uses: may reduce ibs abdominal pain and bloating, may improve gas and global ibs symptoms, may support gut barrier and microbiome balance. 3 sources indexed (2001–2015), with 3 interaction records on file.
The science
How it works, mechanistically.
Core mechanism
L. plantarum 299v can survive GI transit, adhere transiently to intestinal mucosa, influence epithelial barrier signaling, and modulate fermentation and immune responses. In IBS, proposed effects include reduced visceral hypersensitivity, altered gas handling, and shifts in microbial metabolites. The strain may improve iron absorption through meal-matrix or local gut effects, but it is not a replacement for iron therapy.1,2
Class
Strain-specific probiotic for IBS and iron absorption
Found in food
Specific commercial probiotic products listing L. plantarum 299v, Fermented foods may contain other L. plantarum strains but not reliably 299v
Low-status signs
No Lactobacillus plantarum 299v-specific deficiency; dysbiosis may be associated with symptoms but absence of this strain is not a standalone deficiency diagnosis.
Absorption
Water-soluble; take with food
Dosing
Dosing & protocol.
Common range
1-20 billion CFU daily, commonly 10 billion CFU/day for 4-12 weeks
Recommended form
Strain-verified L. plantarum 299v product listing DSM 9843 or 299v on the label
Probiotics act locally in the gut rather than being absorbed like nutrients. Taking with food may improve survival through gastric acid; avoid hot liquids.
Forms
Forms & what to buy.
Ranked by evidence and value.
Strain-Verified Capsule Recommended
Best when label states L. plantarum 299v or DSM 9843 and CFU through expiration. Take with a meal and avoid heat.
Shelf-Stable Tablet
Convenient if viability through expiration is documented. Store according to label; heat can reduce viability.
Food or Beverage Fortification
May support iron absorption in fortified foods when strain is viable. Consume with the iron-containing meal or beverage studied.
Cost
What it actually costs.
Real-world pricing across three quality tiers. Assumes L. plantarum 299v capsule.
BudgetBest value
$11 /mo
$0.35 per dose
Mid
$23 /mo
$0.75 per dose
Premium
$42 /mo
$1.40 per dose
Strain-verified products cost more than generic Lactobacillus blends but are necessary for evidence matching. Updated 2026-06-04.
Goals
Goal-based dosing.
IBS Bloating and Pain
Dose: 10 billion CFU daily for 4-12 weeks1,2
Timing: With breakfast or dinner
Assess response after at least 4 weeks; discontinue if symptoms worsen persistently.
Gut Microbiome Support
Dose: 1-10 billion CFU daily
Timing: With meals
Effects are strain-specific and may not persist after stopping.
Iron Absorption Support
Dose: Product-specific viable dose with iron-containing food3
Timing: With iron-containing meal
Adjunctive only; iron deficiency requires appropriate iron dosing and monitoring.
Why people use it
Symptoms it's matched to.
Where this appears in the symptom-to-supplement map, ranked by relevance.
Bloating
70% relevance
Strain-specific IBS trials show reduced bloating and abdominal discomfort.1,2
DigestiveModerate evidenceL. plantarum 299v capsule
Initial gas can occur but should improve.
Abdominal pain
62% relevance
May reduce visceral hypersensitivity and IBS symptom signaling.1,2
PainModerate evidenceStrain-verified capsule
Persistent severe pain needs evaluation.
Low iron absorption
35% relevance
May improve non-heme iron absorption from fortified foods in some contexts.3
EnergyEmerging evidence299v with iron-containing meal
Monitor ferritin and hemoglobin if treating deficiency.
Safety
Full safety detail.
Side effects
- Temporary gas, bloating, or stool changes
- Mild abdominal discomfort during initiation
- Rare infection risk in severely immunocompromised or critically ill people
- Possible histamine or intolerance reactions in sensitive users
Contraindications
- Severe immunocompromise, neutropenia, central venous catheter, or critical illness without clinician supervision
- Short bowel syndrome or severe D-lactic acidosis history without specialist input1,2
- Known allergy to product excipients
- Do not use as sole treatment for GI alarm symptoms such as bleeding, weight loss, fever, or persistent vomiting1,2
Interactions
Interaction records.
ModerateTiming Sensitive
Berberine
Berberine has antimicrobial activity and may reduce probiotic viability if taken at the same time.
Recommendation: Separate berberine and this probiotic by at least 2-3 hours.
InfoSynergy
Probiotics
Combining probiotic strains may broaden effects but can also increase gas or make response attribution difficult.
Recommendation: Use strain-specific products and add one at a time.
Search all 3 interaction records for Lactobacillus plantarum 299v →
Sources
Sources, by evidence tier.
Numbered references. Citations throughout the page link here.
Randomized controlled trials
2- 1Clinical trial: Lactobacillus plantarum 299v (DSM 9843) improves symptoms of irritable bowel syndromeNeeds reviewNo linkDucrotte P et al. · World Journal of Gastroenterology · 2012
The strain reduced abdominal pain and bloating and improved global symptom assessment in IBS participants.
- 2A controlled, double-blind, randomized study on the efficacy of Lactobacillus plantarum 299V in patients with irritable bowel syndromeNeeds reviewNo linkNiedzielin K et al. · European Journal of Gastroenterology & Hepatology · 2001
L. plantarum 299v improved pain and global symptoms compared with placebo.
Reference material
1- 3Probiotic Lactobacillus plantarum 299v increases iron absorption from an iron-supplemented fruit drink: a double-isotope cross-over single-blind study in women of reproductive ageNeeds reviewNo linkHoppe M et al. · British Journal of Nutrition · 2015
Adding the probiotic increased iron absorption from an iron-fortified beverage in women.
Keep exploring
Deep dives & adjacent profiles.
This page is educational. Do not start, stop, or change a supplement or medication based on it without checking with a qualified healthcare professional.
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