I've tried half a dozen probiotics over the years, but this is the first one where I noticed a real difference within a week. My bloating is almost gone and my digestion feels smooth and regular. The MAKTREK technology must be doing its job.

OPA Probiotic-40 – Digestive Health, Gut Balance & Immune Support with 40 Billion CFU, 60 Capsules
Designed for adults who want reliable digestive comfort, gut balance, and everyday immune support, this extra-strength probiotic delivers 40 Billion CFU of four clinically studied bacterial strains in a simple daily capsule.
Product Snapshot
Designed for adults who want reliable digestive comfort, gut balance, and everyday immune support, this extra-strength probiotic delivers 40 Billion CFU of four clinically studied bacterial strains in a simple daily capsule. Unlike standard probiotic capsules that lose potency to stomach acid before ever reaching the gut, OPA's MAKTREK® Bi-Pass Technology uses a marine polysaccharide complex to physically shield live bacteria through the entire digestive journey. The formula also includes Fructooligosaccharide (FOS) as a built-in prebiotic to nourish those bacteria once they arrive — making it a more complete gut-support system than probiotic-only alternatives that skip this step. Each bottle contains 60 capsules for a 30-day supply, taken as two capsules daily and ideally split between daytime and evening for consistent round-the-clock gut coverage.
WHY SHOPPERS CHOOSE IT
- Shields live bacteria from stomach acid so more reach your gut
- Built-in prebiotic FOS feeds probiotics after they arrive
- 40 Billion CFU delivers extra-strength daily digestive support
- Four targeted strains address digestion and immune defense together
- Split AM/PM dosing keeps gut support steady around the clock
Who It's For
- Adults experiencing frequent bloating, irregularity, or digestive discomfort who want a high-potency daily fix
- People recovering from antibiotic use looking to actively restore and rebalance gut microbiome flora
- Health-conscious adults seeking immune support through gut health with a simple 2-capsule daily routine
- Shoppers who've tried low-CFU probiotics without results and want an extra-strength 40B CFU upgrade
- Adults who need acid-resistant delivery (MAKTREK Bi-Pass) to ensure strains survive to the gut
Not Ideal For
- Children or those needing pediatric-specific probiotic strains and dosing guidance
- Individuals with diagnosed GI conditions (IBD, SIBO) requiring a clinician-supervised, condition-specific protocol
- Buyers wanting broad multi-strain diversity beyond 4 strains for highly targeted microbiome support
What's Inside
- Blend GroupProprietary Blend of Probiotic Bacteria40 Billion CFU
Contains: Lactobacillus acidophilus (La-14), Bifidobacterium lactis (Bl-04), Lactobacillus plantarum (Lp-115), Lactobacillus paracasei (Lpc-37), Marine Polysaccharide Complex, Fructooligosaccharide
How to Take
Take two (2) OPA Probiotic-40 capsules daily as a dietary supplement — one capsule during the day and one capsule in the evening. Swallow each capsule with water and repeat this routine every day for consistent digestive health, gut balance, and immune support. Do not exceed two capsules in a 24-hour period. Each 60-capsule bottle provides a 30-day supply.
Pro Tip: Taking your capsules with a meal may help minimize any initial digestive adjustment and support the live cultures as they pass through your gut.
Shipping Intelligence
- Domestic: USPS transit 3-7; total estimated 5-9
- Domestic: UPS Ground transit 3-5; total estimated 5-7
- International: GlobalPost transit 10-14; total estimated 12-16
- International: UPS Worldwide transit 10-14; total estimated 12-16
- Fulfillment: up to 2 business days
- Ships from: 1615 Lakes Pkwy, Suite C, Lawrenceville, GA 30043
- Fulfillment hours: Monday-Friday 8am-2pm EST
- Domestic returns: 30 days
- International returns: 45 days
- Refund type: store credit only
Warnings & Safety
- Keep out of reach of children. Do not use if safety seal is damaged or missing. Store in a cool, dry place.
- These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.
Certifications / COA
Comparison Highlights
- Delivers 40 Billion CFU per serving via MAKTREK® Bi-Pass Technology, designed to survive harsh stomach acid
- Quad-strain formula: L. acidophilus La-14, B. lactis Bl-04, L. plantarum Lp-115 & L. paracasei Lpc-37
- Includes FOS prebiotic to nourish probiotic cultures and support sustained gut balance
- Marine Polysaccharide Complex reinforces the MAKTREK® acid-bypass delivery system for strain viability
- Split AM/PM dosing (1 capsule twice daily) provides continuous gut support throughout the day
- 30-day supply in 60 capsules — part of OPA's dedicated Gut Series for targeted digestive wellness
Health Benefits
What Buyers Are Saying
21 reviews
I started this during allergy season and noticed I didn't get my usual spring sniffles. Combined with better digestion, this is now a staple in my supplement routine. Two caps a day is super easy.
You get a full 40 billion CFU per serving with 5 strains. The price point is fair for a 30-day supply. I take one in the morning and one at night as suggested and my stomach feels calmer than ever.
For months I dealt with heavy feelings after eating. After two weeks on Probiotic-40, that heaviness is gone. The marine polysaccharide complex and FOS are nice extras you don't see in every probiotic.
Quality matters to me and seeing "Made in USA" gave me confidence. The capsules are easy to swallow and don't have that weird fermented taste some probiotics have. Highly recommend.
Surprised to find that my afternoon slumps disappeared. I assume my gut is finally absorbing nutrients properly. Only gave 4 stars because I wish it came in a 60-count option.
I've been using this for a month and my jeans fit better. Bloating was my biggest issue and this completely tamed it. The CFU count is legit – I checked the lot number and expiration on the bottom.
I had to take antibiotics for a sinus infection and this probiotic helped me bounce back without the usual digestive distress. The 5-strain blend seems broad enough to really repopulate the gut.
Some probiotics give me gas or cramping. This one did the opposite – it actually soothed my system. The Bi-Pass technology clearly helps the bacteria survive stomach acid.
The product itself is fantastic. My gut motility improved significantly within 5 days. I deducted one star because the delivery took longer than expected, but I will reorder.
Frequently Asked Questions
Product, Fit & Composition
Use, Benefits & Buyer Decision
Safety, Trust & Purchase

