NutraBio Green Tea Extract 500 mg Review
#4 of 8 · Best standardized value✓ Label verified · Supplement Facts read Aug 27, 2026Real retailer photo, cut out. Label unedited.
Buy it. A transparent-label ~225 mg EGCG dose from a full-disclosure brand. NutraBio delivers ~225 mg of EGCG per capsule at a clean 95% polyphenols / 75% catechins / 45% EGCG standardization, made in the USA under GMP, from a brand known for no-proprietary-blend labels.
Fair value — transparent-label brandSolid cost per active mg (90 ct)
Why It Scores 8.2 — And The Label Line Behind Each Number
EGCG standardization & dose
35% of score500 mg extract at 95% polyphenols / 75% catechins / 45% EGCG delivers ~225 mg of EGCG — a clean, well-standardized, sensible dose with the numbers fully disclosed. Solid and honest, just a moderate rather than maximal amount.
- EGCG per serving
- ~225 mg EGCG (1 cap; 500 mg extract @ 45% EGCG, 95% polyphenols, 75% catechins)
Purity & third-party testing
30% of scoreNutraBio's strength: a full-disclosure label with no proprietary blends, made in the USA under GMP. The transparent labeling is exactly the trust signal this category lacks, scoring it well on purity even against bigger names.
- Label transparency
- Full standardization stated — no proprietary blends
Safety & caffeine clarity
20% of scoreThe ~225 mg EGCG dose is sensible to take with food, but the caffeine is naturally-occurring rather than headlined on the front label — a small transparency gap versus the picks that state a caffeine number. Solid, not best-in-class on this axis.
- Caffeine
- Naturally occurring — read the label
Value (cost per active mg)
15% of scoreA 90-count bottle at a fair price gives a solid cost per active mg — good value for a transparent, made-in-USA product, though the smaller count means it isn't the cheapest per mg like the 180-/200-count value extracts.
- Size
- 90 capsules (90 servings)
- Price
- Fair value — transparent-label brand, smaller 90-count bottle
- More Specs
- Form
- Capsule (standardized extract)
- Quality
- NutraBio's full-disclosure labeling, made in USA, GMP
Label verified. Every figure read from the Supplement Facts photo, Aug 27, 2026.
Marketing Claims Vs. Reality
500 mg green tea extract at 95% polyphenols / 75% catechins / 45% EGCG (~225 mg EGCG).
The listing states a 500 mg green tea extract standardized to 95% polyphenols, 75% catechins, and 45% EGCG, computing to ~225 mg of EGCG per capsule. Fully disclosed and holds up as stated.
Full-disclosure label, no proprietary blends.
Consistent with NutraBio's brand reputation and the listing's complete standardization breakdown. The no-proprietary-blend, transparent-label positioning is accurate and a genuine differentiator.
Made in the USA under GMP.
The listing states made-in-USA, GMP-produced manufacturing, consistent with NutraBio's established production. Accurate as stated.
Adds antioxidant benefits and helps overall health and well-being.
Directionally accurate — catechins are antioxidants — but a broad wellness claim, not a proven product-specific outcome. Reasonable as a category statement; the weight effect specifically is modest (Hursel 2009).
What Our Test Actually Found
The full-disclosure label is the reason to buy it
NutraBio built its name on transparent labeling with no proprietary blends, and this product reflects that: you see the exact standardization — 95% polyphenols, 75% catechins, 45% EGCG — rather than a vague 'green tea extract' line. In a category where honesty varies widely, that traceability is a real trust signal and the core of its 'best standardized value' case.
A sensible ~225 mg dose, easy to run
At ~225 mg of EGCG per capsule, this is a moderate, well-judged dose — comparable to NOW's ~200 mg and easy to take with food without any special dosing rules. It's the kind of sane amount that fits most people and stays comfortably below the EFSA liver-safety ceiling.
Caffeine is the one small transparency gap
Unlike Zhou or Life Extension, NutraBio doesn't headline its caffeine number on the front panel — it's naturally-occurring and you read it off the label. That's a minor gap for a brand otherwise defined by disclosure, and the reason it scores a touch lower on the safety-and-caffeine-clarity axis than the picks that state a caffeine figure.
Smaller bottle caps the value ceiling
The 90-count bottle is a smaller supply than the 180- or 200-count value extracts, so the cost per active mg isn't rock-bottom. It's fair value for a transparent, made-in-USA GMP product — you're paying for the label honesty — but if pure cost per mg is the goal, a big-count budget extract wins.
Full analysis: all pros & cons (6), buy if / skip if
- Clean standardization — 95% polyphenols / 75% catechins / 45% EGCG (~225 mg EGCG)
- NutraBio is known for transparent, no-proprietary-blend labels — you see exactly what's in it
- Sensible ~225 mg EGCG dose — easy to take safely with food
- Made in the USA in a GMP facility
- 90-count bottle is a smaller supply than the value leaders
- Caffeine is naturally occurring rather than explicitly headlined — check the label
- You value a transparent, full-disclosure label with no proprietary blends
- You want a sensible ~225 mg EGCG dose that's easy to take safely with food
- You want a made-in-USA, GMP-produced extract
- You prefer clean standardization over a giant 'extract mg' headline
- You want the largest bottle for the lowest cost per mg — the 90-count runs smaller
- You want caffeine explicitly stated — Zhou (#3) or Life Extension (#2) headline it; here it's naturally occurring
- You want the highest standardized EGCG per capsule — Nature's Wellness 98% (#6)
NutraBio delivers ~225 mg of EGCG per capsule at a clean 95% polyphenols / 75% catechins / 45% EGCG standardization, made in the USA under GMP, from a brand known for no-proprietary-blend labels. It's a sensible, trustworthy mid-list pick. The knocks are a smaller 90-count bottle and caffeine that's naturally-occurring rather than headlined. Take it with food and it's an easy, honest choice.
NutraBio's Green Tea Extract is an honest, well-made mid-list pick from a brand that built its reputation on full-disclosure labeling. The standardization is clean — 95% polyphenols / 75% catechins / 45% EGCG, about 225 mg of EGCG per capsule — the dose is sensible and easy to take safely with food, and the made-in-USA GMP production is reassuring. It ranks #4 mainly on supply and reach: the 90-count bottle is smaller than the value leaders, and the caffeine is naturally-occurring rather than spotlighted on the front label. If you value a transparent label and a sane EGCG dose over a big bottle, it's an easy, trustworthy choice — and, like every pick here, a modest fat-loss adjunct on top of a deficit, not a fat burner.
An honest, transparent-label mid-list pick — buy it for the disclosure and the sane dose.
NutraBio's Green Tea Extract is an honest, well-made mid-list pick from a brand that built its reputation on full-disclosure labeling. The standardization is clean (95% polyphenols / 75% catechins / 45% EGCG, about 225 mg of EGCG per capsule), the dose is sensible and easy to take safely with food, and the made-in-USA GMP production is reassuring. It ranks #4 mainly on supply and reach — the 90-count bottle is smaller than the value leaders, and the caffeine is naturally-occurring rather than spotlighted on the front label. If you value a transparent label and a sane EGCG dose over a big bottle, it's an easy, trustworthy choice — a modest adjunct on top of a calorie deficit, taken with food.
If This Doesn’t Fit — Try These
01NOW EGCg Green Tea Extract
If you want one green tea extract and you want it to be the safe, sensible choice, NOW's EGCg 400 mg is it.
03Zhou Green Tea Extract
Zhou's Green Tea Extract is a clean, transparent, well-balanced mid-list pick.
05Jarrow Green Tea 500 mg
Jarrow's Green Tea is the gentle, water-extracted option and a genuinely sensible budget buy.
Quick Answers
How much EGCG is in a NutraBio capsule?
About 225 mg. Each capsule is 500 mg of green tea extract standardized to 95% polyphenols, 75% catechins, and 45% EGCG, which works out to roughly 225 mg of EGCG. That's a sensible, moderate dose — easy to take with food and comfortably below EFSA's 800 mg EGCG/day liver-safety flag.
Why does NutraBio's 'full-disclosure label' matter?
NutraBio built its reputation on transparent labeling with no proprietary blends — you see the exact standardization (95% polyphenols / 75% catechins / 45% EGCG) rather than a vague 'green tea extract' line. In a category where extract quality and honesty vary a lot, that traceability is a real trust signal, and it's the main reason this earns the 'best standardized value' framing.
How much caffeine does it have?
The caffeine is naturally occurring and you should read the exact amount off the label rather than assume it's decaffeinated. It's not spotlighted on the front panel the way Zhou's or Life Extension's is, which is a small transparency gap. If a stated, low caffeine number matters to you, NOW (#1, ~4 mg) or a decaf option is a better fit.
Is the 90-count bottle a drawback?
Slightly, on value. A 90-count bottle is a smaller supply than the 180- or 200-count value extracts, so the cost per active mg isn't rock-bottom. But you're paying for a transparent, made-in-USA GMP product — a fair trade if you value the label honesty over the absolute lowest price per mg.
Sources & Further Reading
3 peer-reviewed sources, each linked to PubMed
- [1] Hursel 2009 PMID 19597519 — The effects of green tea on weight loss and weight maintenance: a meta-analysis. Meta-analysis of 11 studies: green tea catechins were associated with a modest ~1.3 kg mean weight change, clearest with caffeine. Keeps NutraBio's wellness framing in honest perspective — a small adjunctive effect.
- [2] Hu 2018 PMID 29580974 — The safety of green tea and green tea extract consumption in adults — Results of a systematic review. Systematic review: liver-related adverse effects were associated with high-dose extract taken fasted. Supports taking NutraBio's ~225 mg EGCG dose with food.
- [3] Isomura 2016 PMID 27188915 — Liver-related safety assessment of green tea extracts in humans: a systematic review of randomized controlled trials. Systematic review of RCTs: liver-enzyme elevations clustered at higher EGCG doses — reinforcing that NutraBio's moderate ~225 mg dose is a sensible, lower-risk amount.
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