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2021's Top 5 Probiotics For Gas, Bloating, & Diarrhea Support

What top scientists are discovering about our gut and how it can dramatically affect the quality of our lives.

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At Smarter Reviews, we employ a comprehensive evaluation system to analyze and measure the full value of products, by looking at the ingredients, safety, projected effectiveness, return policies, and overall customer satisfaction. After extensive research, here are our picks for the top probiotics of 2021.

1. Complete Probiotics Platinum

Total Ranking

647 votes

9.6/10

A+

Overall Grade

  • Ingredient Safety
    8.0 Avg.

    9.8/10

  • Projected Effectiveness
    8.5 Avg.

    9.6/10

  • Value
    8.0 Avg.

    9.6/10

  • Return Policy
    8.0 Avg.

    9.7/10

  • Customer Satisfaction
    8.3 Avg.

    9.6/10

    Vote and Review

Vote and Review

5/10

Vote and Review

5/10

PROS

  • Contains 51 billion live cultures in each capsule 
  • 11 diverse strains
  • Endorsed by an MD 
  • Each capsule is acid-resistant
  • 100% Vegan
  • NutraFlora Prebiotic Fiber is included
  • Only one capsule per day is needed
  • Has no synthetic fillers or binders
  • Each substrain is listed and has been clinically studied.

CONS

  • Due to popularity, sometimes it's on backorder/sold out
The Bottom Line

Our Smarter Shoppers have voted 1MD's Complete Probiotics Platinum the most popular daily probiotic they tried. It is one of the best formulas on the market, due to its 51 billion live cultures, 11 robust and clinically studied strains, NutraFlora prebiotic fiber, vegan capsule composition, and no synthetic fillers or additives.

This was the only product we could find that has been endorsed by an MD, specifically a Gastroenterologist (gut and digestive health physician). It was also the only one that listed each of its clinically studied substrains. Our Smarter Shoppers absolutely loved this probiotic blend.

*Results are based on the Smarter Reviews Ranking System and do not necessarily reflect typical results from the use of these products. Please visit product websites for more information.

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2. Pro-45

Total Ranking

214 votes

9.5/10

A

Overall Grade

  • Ingredient Safety
    8.0 Avg.

    9.1/10

  • Projected Effectiveness
    8.5 Avg.

    9.3/10

  • Value
    8.0 Avg.

    9.2/10

  • Return Policy
    8.0 Avg.

    8.9/10

  • Customer Satisfaction
    8.3 Avg.

    9.1/10

    Vote and Review

Vote and Review

5/10

Vote and Review

5/10

PROS

  • Provides 45 billion live cultures
  • 11 clinically proven strains
  • No fillers or additives
  • 365-day return policy
  • NutraFlora Prebiotic Fiber included 
  • Dairy and gluten free, vegetable capsules

CONS

  • Not endorsed by an MD
The Bottom Line

LiveWell Nutrition came in at a respectable #2 on our list, with a potent 45 billion CFUs and 11 strains.   

Pro45 offers vegetarian delayed release capsules and pure ingredients. We confirmed that there are no unhealthy fillers or additives. We also checked its 365-day return policy and were impressed by how easy and straightforward it was. Our Smarter Shoppers gave this product high marks in the categories of customer service, returns, and overall effectiveness. 

Unfortunately, it's not endorsed by an MD, but easy to order through their Amazon store. Though the reviews were stellar and ingredients are pure, the lack of medical endorsement led this product to come in a close second place on our top picks.*

*Results are based on the Smarter Reviews Ranking System and do not necessarily reflect typical results from the use of these products. Please visit product websites for more information.

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3. Extra Care 50 Billion

Total Ranking

263 votes

8.9/10

B+

Overall Grade

  • Ingredient Safety
    8.0 Avg.

    8.8/10

  • Projected Effectiveness
    8.5 Avg.

    8.7/10

  • Value
    8.0 Avg.

    9.1/10

  • Return Policy
    8.0 Avg.

    9.2/10

  • Customer Satisfaction
    8.3 Avg.

    8.8/10

    Vote and Review

Vote and Review

5/10

Vote and Review

5/10

PROS

  • Provides 50 billion organisms per serving 
  • Dairy and gluten-free, vegetable capsules

CONS

  • Reports of less capsules in bottle than on label
  • No money-back guarantee
  • Refrigeration recommended for best quality and efficacy
The Bottom Line

Some Smarter Shoppers stated that the storage guidelines of this product was inconvenient.* Although the product contains over 50 billion live cultures, many reviewers believed the product lost its potency due to poor refrigeration by delivery.*

*Results are based on the Smarter Reviews Ranking System and do not necessarily reflect typical results from the use of these products. Please visit product websites for more information.

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4. Digestive Health Probiotic

Total Ranking

494 votes

8.7/10

B+

Overall Grade

  • Ingredient Safety
    8.0 Avg.

    8.4/10

  • Projected Effectiveness
    8.5 Avg.

    8.6/10

  • Value
    8.0 Avg.

    8.4/10

  • Return Policy
    8.0 Avg.

    8.8/10

  • Customer Satisfaction
    8.3 Avg.

    8.5/10

    Vote and Review

Vote and Review

5/10

Vote and Review

5/10

PROS

  • Can be found in retail stores
  • Dairy and gluten-free, vegetable capsules

CONS

  • Only offers 10 billion CFUs per serving
  • Contains unhealthy, synthetic fillers
  • Only contains one probiotic strain, Lactobacillus GG
The Bottom Line

This product only offers one probiotic strain, Lactobacillus GG. In addition, this product only contains 10 billion live cultures. Smarter Shoppers noticed fairly short expiration dates. This product contains undesirable fillers and added colors such as gelatin, sucrose, maltodextrin, magnesium stearate, and titanium dioxide.*

*Results are based on the Smarter Reviews Ranking System and do not necessarily reflect typical results from the use of these products. Please visit product websites for more information.

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5. Primal Probiotics

Total Ranking

571 votes

7.9/10

C+

Overall Grade

  • Ingredient Safety
    8.0 Avg.

    8.5/10

  • Projected Effectiveness
    8.5 Avg.

    8.3/10

  • Value
    8.0 Avg.

    8.3/10

  • Return Policy
    8.0 Avg.

    8.1/10

  • Customer Satisfaction
    8.3 Avg.

    7.9/10

    Vote and Review

Vote and Review

5/10

Vote and Review

5/10

PROS

  • Contains 12 probiotic strains
  • Clinically studied strains
  • Shelf-stable

CONS

  • Contains only two prebiotic nutrients
  • Only 31 billion CFU
  • Includes fillers such as magnesium stearate
  • Prebiotics backed by limited clinical studies 
The Bottom Line

Primal Probiotics contains a respectable 12 separate strains of clinically-studied probiotics.

Where Primal Harvest falls short, however, is that it contains only two prebiotic fibers, whereas several are needed to feed the various strains.  Unfortunately, this product also has fillers such as magnesium stearate, which are completely unnecessary.

Still, its commitment to clinically studied strains and shelf-stable bottle give it an edge over many other probiotics. 

*Results are based on the Smarter Reviews Ranking System and do not necessarily reflect typical results from the use of these products. Please visit product websites for more information.

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