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The Science

It all comes back to one hormone.

Insulin is the most powerful metabolic hormone in your body. When it works, everything works. When it stops working — quietly, gradually, often years before anyone notices — almost every system downstream of it starts to drift.

Insulin is your body's energy traffic controller. Every time you eat — especially carbs — your pancreas releases insulin to escort glucose out of the bloodstream and into your cells.

When the system runs smoothly, hormones downstream of insulin — estrogen, testosterone, cortisol, thyroid — stay in their lanes.

But cells can stop listening. This is insulin resistance — the most overlooked driver of stubborn belly fat, the 3pm energy crash, creeping cholesterol, PCOS symptoms, and the slow drift toward type 2 diabetes.

Berberine is one of the most-studied natural compounds for supporting healthy insulin response. It works through AMPK — often described as the master switch of cellular energy — to help cells respond to insulin the way they're supposed to.

01

You eat. Insulin rises.

Carbs and sugars enter the bloodstream. The pancreas releases insulin — the hormone that signals cells to absorb glucose.

02

Cells stop listening.

Over time, cells become less responsive. The pancreas releases more insulin to compensate. Glucose stays high. Damage compounds.

03

Berberine activates AMPK.

Berberine switches on AMPK — your cells' energy regulator. AMPK tells cells to absorb glucose again, even when insulin signaling is impaired.

04

The system resets.

Glucose gets used instead of stored. Insulin levels normalize. Energy stabilizes. Symptoms downstream of the broken signal begin to ease.

Insulin resistance is the master mechanism behind belly fat, energy crashes, creeping cholesterol, PCOS, and the drift toward type 2 diabetes.

Fix the signal — and the symptoms downstream begin to change.

The Evidence Base

One of the most-studied molecules in natural medicine.

Not a new compound. Not a trend. Berberine has been used in traditional medicine for over 3,000 years — and in the last two decades, modern research has caught up.

50+

Randomized controlled trials on berberine for metabolic health

Pubmed · 2003–2024

9k+

Participants studied across published trials

Aggregate meta-analysis

0.71%

Average HbA1c reduction at 1,500mg / day

27-RCT meta-analysis

3,000

Years of use in traditional medicine

Ethnobotanical record

Published Research

The studies we matched the dose to.

We didn't pick 1,500mg because it sounded impressive. We picked it because that's the dose nearly every major clinical trial used.

Meta-Analysis · 27 RCTs

Journal of Ethnopharmacology · 2015

Berberine for type 2 diabetes — efficacy comparable to first-line oral medications

Analysis of 27 randomized trials across 2,569 participants found berberine produced reductions in HbA1c, fasting blood glucose, and post-meal glucose comparable to metformin — with a favorable safety profile.

2,569

Participants

0.71%

HbA1c reduction

1,200mg

Effective dose

RCT · PCOS

European Journal of Endocrinology · 2012

Berberine vs. metformin in women with PCOS — comparable efficacy

Randomized trial in 89 women with PCOS compared berberine 1,500mg/day against metformin and placebo. Berberine matched metformin on insulin sensitivity, lipid profile, and ovulation rates.

89

Women

3 mo

Duration

≈ MET

vs. metformin

Meta-Analysis · 16 RCTs

Planta Medica · 2013

Lipid-modifying effects of berberine — LDL reductions through a statin-like mechanism

Aggregate analysis of 16 RCTs showed berberine reduced LDL by ~25 mg/dL and triglycerides by 44 mg/dL via upregulation of hepatic LDL receptors.

−25

LDL (mg/dL)

−44

TG (mg/dL)

16

RCTs pooled

Mechanism Study

Nature Medicine · 2004

Berberine activates AMPK — identification of the master metabolic mechanism

Landmark study identifying AMPK as berberine's primary molecular target. AMPK activation triggers glucose uptake, fatty acid oxidation, and energy regulation.

AMPK

Target

2004

Landmark year

3,400+

Citations since

What To Expect

This is a recalibration — not a stimulant.

Week 1–2

The settling phase

Your gut adjusts to the compound. Some people experience mild digestive shifts the first week — typically resolves by day 7. Cravings begin to soften.

✓

Week 3–4

Steadier energy

The 3pm crash eases. Energy holds through the afternoon. Sugar cravings noticeably reduced. Sleep often deepens for those whose blood sugar disrupted it.

✓

Week 6–8

Composition shifts

Subtle body composition changes — particularly around the midsection — become visible. Clothes fit differently before the scale catches up.

✓

Week 10–12

Bloodwork shifts

If you retest at this point, expect to see movement in HbA1c, fasting insulin, LDL, and triglycerides. This is the receipt.

✓

Reviewed By

Our formulas are reviewed by practicing clinicians.

Every Cleravive product is reviewed by an independent medical advisory board before it ships. Doses are matched to published trials, not to margin targets.

S

Dr. Sarah Lindsey, MD

Endocrinology · Internal Medicine

"The case for berberine isn't speculative. The mechanism is well-characterized, the trials are replicated, and at 1,500mg per day it produces measurable changes in the same metabolic markers we manage clinically."

M

Dr. Maya Chen, ND

Naturopathic Medicine · Women's Health

"In my practice I see insulin resistance driving symptoms patients have been told are 'just hormones' for years. Berberine, dosed properly, is one of the few natural compounds with clinical data robust enough to recommend."

What's Inside

The whole formula. The whole label.

Three capsules. One active ingredient. The dose the studies actually used.

What we left out — and why most brands don't

✕Magnesium stearate✕Silicon dioxide✕Microcrystalline cellulose✕Rice flour✕Titanium dioxide✕Maltodextrin✕Artificial colors✕Proprietary blends

01

Berberine HCl

Berberis aristata root extract, 97% standardized

Matches the dose used in the major clinical trials for insulin sensitivity, HbA1c reduction, PCOS, and LDL cholesterol. Split across 3 capsules to maintain steady plasma levels.

Clinical dose

1,500mg

02

Vegetable capsule

HPMC — plant cellulose

The capsule itself. No gelatin, no animal products. That's it. That's the whole formula.

Carrier

How we compare

Built differently from the ground up.

	Typical Amazon berberine	Typical Whole Foods berberine	Cleravive 001
Daily dose	500–1,200mg	600–1,000mg	1,200mg ✓
Matches clinical study dose	No	No	Yes
Proprietary blend	Often	Often	None
Magnesium stearate	Yes	Yes	None
Silicon dioxide / rice flour	Yes	Often	None
3rd-party tested	Sometimes	Sometimes	Every batch

Customer reviews

What the 2,400+ say.

5 ★

84%

4 ★

11%

3 ★

3%

2 ★

1%

1 ★

1%

★★★★★

"My A1C went from 5.9 to 5.4 in twelve weeks."

Took three capsules a day with meals. Didn't change anything else about my diet because I wanted to know if the supplement was actually doing something. Bloodwork at the 3-month mark was the proof.

JR

Jennifer R. · Prediabetes · age 51

✓ Verified

★★★★★

"The first thing that actually moved the belly weight."

I'm 46, perimenopausal, and have been gaining weight around my middle for two years. Eight weeks on Cleravive and my waist is down an inch. Energy is steadier.

SK

Sarah K. · Perimenopause · age 46

✓ Verified

★★★★★

"LDL dropped 22 points without statins."

My cardiologist suggested a statin. I asked if I could try berberine for 90 days first. Came back to the recheck with LDL down 22 points.

MT

Marcus T. · High cholesterol · age 58

✓ Verified

Q

Why We Built This

I read thirty supplement labels. I couldn't trust any of them.

Most berberine on the market is dosed at half the clinical research level, padded with fillers nobody asked for, and hidden behind "proprietary blends."

Cleravive exists because a supplement company shouldn't optimize for the cheapest cost-per-bottle. It should optimize for whether the thing actually works — at the dose the research used.

If the studies say 1,200mg, we put 1,200mg in the bottle. If a filler doesn't earn its place, we don't add it. The label tells you the whole story. That's the entire pitch.

Sara

Founder · Cleravive

Honest Answers

The questions worth answering.

Is this "nature's Ozempic"?

No, and we won't pretend otherwise. Ozempic targets GLP-1 and produces fast appetite suppression. Berberine works on a different pathway — insulin sensitivity through AMPK — and produces modest, gradual changes over weeks and months.

How long until I feel something?

Most people notice steadier energy and reduced sugar cravings within 2–4 weeks. Body composition changes typically show up at 6–12 weeks. Bloodwork shifts usually appear at the 8–12 week recheck.

Why 1,500mg? Other brands use less.

Because that's the dose the research used. The major trials nearly all used 1,500mg/day, split into three doses. Brands using 500–1,000mg are dosing for cost, not effect.

Can I take this if I'm on metformin or a GLP-1?

Talk to your prescriber first. Berberine lowers glucose. If you're on metformin, Ozempic, Mounjaro, or any glucose-lowering medication, combining them without supervision can push glucose too low.

What if it doesn't work for me?

90-day guarantee. Finish the bottle, retest your bloodwork if relevant, see how you feel. If it didn't do what we said it would, we refund you. No questions, no return shipping.

Are there side effects?

The most common is mild GI upset in the first week as your gut adjusts. Taking capsules with food and starting with one capsule per day for the first 3 days reduces this significantly. Not recommended during pregnancy or breastfeeding.