Founder review · MGB+ Cool

I'm an ER doctor. I tested 11 gut supplements. Here's what won.

I built one of them. I'll tell you which. Here's how they all scored.

Rick Pescatore, D.O.

Founder, BellyMD · ER physician

4.7★·Made in USA·Lab tested·12-week refund

See the ranking

MGB+ Cool, the supplement Rick Pescatore built for what acid blockers don't touch

Founder review

The ranking

11 supplements. One winner.

Swipe through. Same six checks, every product.

What I scored on

Dose · Mechanisms · B1 form · Label honesty · Fillers · Lab tested

WINNER

★★★★★ 4.7 / 5

MGB+ Cool

Built for what acid blockers don't touch.

$47

✅ Dose — Mastic gum 500mg, allithiamine 150mg. Study-grade.
✅ Mechanisms — Lining, motility, immune signal, nerves. Four in one.
✅ B1 form — Allithiamine. Fat-soluble. Reaches the nerves.
✅ Label honesty — Every dose in mg. No blends.
✅ Fillers — None.
✅ Lab tested — Every batch.

I'm biased. I built it. The reason I built it is everything below missed at least one.

Try Cool with COOL15

RUNNER-UP

★★★★☆ 4.0 / 5

Jarrow Mastic Gum

Right ingredient, alone.

~$28

✅ Dose — 500mg, the studied dose.
❌ Mechanisms — One.
❌ B1 form — None.
✅ Label honesty — Clear.
⚠️ Fillers — Magnesium stearate.
⚠️ Lab tested — Brand-asserted.

Right ingredient. Wrong stack. You'd need three more bottles to match Cool.

3RD

★★★★☆ 4.1 / 5

Seed DS-01

Great product. Wrong job.

$49.99/mo

✅ Dose — For probiotics.
❌ Mechanisms — Probiotic only.
❌ B1 form — None.
✅ Label honesty — Strain-level.
✅ Fillers — None.
✅ Lab tested — Yes.

Built for general microbiome. Not for the heavy, burning, after-meal pattern.

4TH

★★★★☆ 4.0 / 5

PepZin GI

One ingredient, well-dosed.

~$22

✅ Dose — 75mg zinc-carnosine.
❌ Mechanisms — One.
❌ B1 form — None.
✅ Label honesty — Clear.
⚠️ Fillers — Cellulose, stearate.
⚠️ Lab tested — Limited public data.

Cool uses the same compound, plus six more, in one bottle.

5TH

★★★☆☆ 3.8 / 5

NOW Foods DGL

Cheap, narrow, honest.

~$10

✅ Dose — 400mg DGL.
❌ Mechanisms — One.
❌ B1 form — None.
✅ Label honesty — Clear.
⚠️ Fillers — Sorbitol, flavor.
✅ Lab tested — In-house.

Honest product, fair price. Same gap: one mechanism, not the stack.

6TH

★★★★☆ 4.2 / 5

Designs for Health GI-Revive

Real brand. Hidden doses.

~$60

❌ Dose — Hidden in a blend.
✅ Mechanisms — Yes.
❌ B1 form — None.
❌ Label honesty — Blend hides amounts.
✅ Fillers — None disclosed.
✅ Lab tested — GMP facility.

This one bugs me most. You can't see how much of anything you're taking. That's a line.

7TH

★★★★☆ 4.6 / 5

AG1

Famous. Wrong category.

$99/mo

❌ Dose — 75 ingredients, most too small to do much.
❌ Mechanisms — A multivitamin, not gut-targeted.
❌ B1 form — Water-soluble. Doesn't reach the nerves.
❌ Label honesty — Blends throughout.
✅ Fillers — None added.
✅ Lab tested — NSF certified.

Good brand, wrong product. AG1 doesn't have a real dose of anything that calms the upper gut.

8TH

★★☆☆☆ 3.0 / 5

Pepto-Bismol

Symptom mask. Not daily.

~$10

✅ Dose — At label dose.
❌ Mechanisms — Coats and dampens. Doesn't shift the pattern.
❌ B1 form — None.
✅ Label honesty — FDA-regulated.
⚠️ Fillers — Salicylate-sensitive should avoid.
✅ Lab tested — FDA-regulated.

Works for two days at a time. Cool is for the pattern that keeps sending you back to the Pepto.

Cool is a supplement, not a replacement for any medication you take. Comparisons reflect public product labels.

Founder note

This is what I built it for.

Ten years in the ER. Same patient, same upper-gut pattern, sent home on another acid blocker that doesn't fix the lining, the motility, or the bug they might be carrying.

Cool was built for those four layers. If the ranking lined up with the gut you live with, this is the one to try. 12 weeks. If nothing shifts, we refund it.

Rick Pescatore, D.O.

Founder, BellyMD · ER physician

Try MGB+ Cool with COOL15 Not sure? Take the 60-second quiz

12-week refund · free shipping on every order

Stack the formula

Pair Cool with the rest of the line.

DGBI rarely lives in one zone. The formulas are built to stack — and they share a single subscription cadence. Save 15% with any Duo, 20% with the Trio.

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Add Clear as a Duo

For the days the burn travels into bloating and brain fog. 15% off both.

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Add Calm as a Duo

For mornings that start with the stomach turning. 15% off both.

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Common questions

What people ask before they buy.

How long until I feel something?

Ginger acts fast. Most people notice less post-meal burn in the first week. The lining-support layer takes four to twelve weeks. If nothing has shifted by week twelve, we refund it.

Can I take Cool with my acid blocker?

Yes. Cool works alongside acid blockers, not against them. The acid blocker handles acid. Cool handles the lining, motility, and immune signal. Talk to your doctor before changing any prescribed medication.

I've tried mastic gum and it didn't work. Why is this different?

Two reasons. The dose: most products use 200mg or less. Cool uses 500mg, the studied dose. And mastic alone is one mechanism. Cool pairs it with six more.

Any fillers, dyes, or seed oils?

None. Plant capsule. No dyes, no seed oils, no talc, no magnesium stearate.

What's the 12-week guarantee?

Twelve weeks is the real window for an upper-gut pattern to shift. If yours hasn't moved by then, email us within 90 days and we refund it. No bottle return.

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