Scored on the same 100-point, five-axis rubric. Third-party comparisons are limited to overseas brands, and unverifiable low-quality items appear as a category rather than by name.
Published
2026-08-20
·
Last reviewed
2026-08-20
·
Data as of
2026-08 — Based on official retailer listings and published test reports
97% standardised with lot-level testing in an NSF-certified facility; 500 mg capsules make 1,000–1,500 mg/day easy to reach (~$0.33 per 500 mg)
Cost per active unit
Not calculable
Daily cost · Women
—
Daily cost · Men
—
Days of supply
—
Axis scores
Effective dose
30/30
Purity & impurity testing
23/25
Manufacturing & safety certification
18/20
Raw-material grade
8/15
Information transparency
9/10
Retailer link pending
A
73/100
Double Wood Berberine (US)
Third-party testing and GMP, but weak standardisation labelling (~$0.33 per 500 mg)
Cost per active unit
Not calculable
Daily cost · Women
—
Daily cost · Men
—
Days of supply
—
Axis scores
Effective dose
28/30
Purity & impurity testing
18/25
Manufacturing & safety certification
14/20
Raw-material grade
5/15
Information transparency
8/10
Retailer link pending
B
56/100
BulkSupplements Berberine Powder (US)
Ultra-low-cost powder with limited standardisation and lot-testing disclosure (~$0.09–0.20 per 500 mg)
Cost per active unit
Not calculable
Daily cost · Women
—
Daily cost · Men
—
Days of supply
—
Axis scores
Effective dose
26/30
Purity & impurity testing
12/25
Manufacturing & safety certification
10/20
Raw-material grade
0/15
Information transparency
8/10
Retailer link pending
C
11/100
"Contains Coptis extract" diet blends
Actual berberine content undisclosed — cost not calculable
Cost per active unit
Not calculable
Daily cost · Women
—
Daily cost · Men
—
Days of supply
—
Axis scores
Effective dose
5/30
Purity & impurity testing
0/25
Manufacturing & safety certification
4/20
Raw-material grade
0/15
Information transparency
2/10
See axis-level scores (5 axes, 100 points)
Product
① Effective dose/30
② Purity & impurity testing/25
③ Manufacturing & safety certification/20
④ Raw-material grade/15
⑤ Information transparency/10
Thorne Berberine (US, Berbevis®)
28
22
19
15
9
Toniiq Berberine 97% (US)
30
23
18
8
9
Double Wood Berberine (US)
28
18
14
5
8
BulkSupplements Berberine Powder (US)
26
12
10
0
8
"Contains Coptis extract" diet blends
5
0
4
0
2
Thorne Berberine (US, Berbevis®)
① Effective dose
28/30
② Purity & impurity testing
22/25
③ Manufacturing & safety certification
19/20
④ Raw-material grade
15/15
⑤ Information transparency
9/10
Toniiq Berberine 97% (US)
① Effective dose
30/30
② Purity & impurity testing
23/25
③ Manufacturing & safety certification
18/20
④ Raw-material grade
8/15
⑤ Information transparency
9/10
Double Wood Berberine (US)
① Effective dose
28/30
② Purity & impurity testing
18/25
③ Manufacturing & safety certification
14/20
④ Raw-material grade
5/15
⑤ Information transparency
8/10
BulkSupplements Berberine Powder (US)
① Effective dose
26/30
② Purity & impurity testing
12/25
③ Manufacturing & safety certification
10/20
④ Raw-material grade
0/15
⑤ Information transparency
8/10
"Contains Coptis extract" diet blends
① Effective dose
5/30
② Purity & impurity testing
0/25
③ Manufacturing & safety certification
4/20
④ Raw-material grade
0/15
⑤ Information transparency
2/10
Third-party comparisons are limited to overseas brands. Among domestically distributed products, only our own is included. Product links carry no affiliate arrangement. A purchase through a link does not affect any grade or its position. Based on official retailer listings and published test reports · Data as of 2026-08
So which one should you choose?
To summarise — actual berberine HCl content rather than Coptis extract, standardisation to 97%+ with lot testing, a cGMP/NSF facility, and absorption technology.
If you want to follow the study protocol as written —
토SToniiq Berberine 97% (US)
It publishes 97% standardisation and lot-level test results in 500 mg capsules, which reproduces the study protocol — 500 mg before meals — directly. It requires two to three doses a day.
If you want the low bioavailability engineered around —
쏜SThorne Berberine (US, Berbevis®)
Berbevis® phytosome is a patented raw material with human absorption data — the direct answer to berberine's core weakness. Certification is the highest here, but it sits in a premium tier and its price is unconfirmed, so we could not calculate a per-serving cost.
Berberine is not "nature's Ozempic" and does not replace medication. Do not take it during pregnancy or breastfeeding, and consult a physician or pharmacist if you take any medication, including glucose-lowering drugs.
Independence: This site is operated by KNI. Every product is scored against the same public criteria, and advertising or affiliate arrangements play no part in grading.
+The right answer to berberine's low bioavailability
+Highest certification level here
Unverified or unmet
−Price pending confirmation — per-serving cost not calculable
−Premium price tier
S
Toniiq Berberine 97% (US)
97% standardised with lot-level testing in an NSF-certified facility; 500 mg capsules make 1,000–1,500 mg/day easy to reach (~$0.33 per 500 mg)
88/100
Criteria met
+97% standardisation with published lot-level results
+Format matches the study protocol (500 mg before meals)
+NSF-certified facility
Unverified or unmet
−No absorption-engineered raw material (e.g. phytosome), capping the raw-material axis
−Requires 2–3 doses per day
A
Double Wood Berberine (US)
Third-party testing and GMP, but weak standardisation labelling (~$0.33 per 500 mg)
73/100
Criteria met
+Publishes third-party test results
+Good value
Unverified or unmet
−Weak standardisation labelling makes lot-to-lot variation hard to assess
−No named ingredient brand
B
BulkSupplements Berberine Powder (US)
Ultra-low-cost powder with limited standardisation and lot-testing disclosure (~$0.09–0.20 per 500 mg)
56/100
Criteria met
+Lowest per-serving cost
Unverified or unmet
−Limited standardisation and lot-testing disclosure
−Powder measuring reduces dosing accuracy
C
"Contains Coptis extract" diet blends
Actual berberine content undisclosed — cost not calculable
11/100
Criteria met
—
Unverified or unmet
−Actual berberine content undisclosed — you cannot tell whether studied doses are reached
−Often paired with "nature's Ozempic" marketing; treat with caution
What was this scored on?
① Effective dose 30
Does the actual daily intake reach the dose range used in human studies — not the number in the product name?
② Purity & impurity testing 25
Published purity figures plus third-party COA, with verifiable impurity and heavy-metal testing.
③ Manufacturing & safety certification 20
cGMP/FDA-registered facilities, ingredient-specific certifications (Self-GRAS, NSF), and toxicology data (GLP).
④ Raw-material grade 15
Named ingredient brand — whether a verified supplier such as Creapure®, Uthever® or Setria® is used.
⑤ Information transparency 10
Full ingredient and dose disclosure, convertible labelling, and claims free of exaggeration.
Independence: This site is operated by KNI. Every product is scored against the same public criteria, and advertising or affiliate arrangements play no part in grading. KNI does not sell supplements. Grades reflect KNI's own published criteria and are not a government or accreditation-body certification.
