why aren't there actual tests results but instead we are told to "see the stamp" lol?

Because the level of faith and trust in a product you are purchasing to introduce into your body, a faith that test results, for what I assume you to mean, 'product authenticity testing', along with tests for adulterants and dilutants, and overall consumer product packaging claim veracity testing, would so succinctly confer, is expensive, and lends itself to an even more expensive word, accountability. In an industry where it is simply much more profitable to forgo the aforementioned testing, than to include it, since almost no restrictions or product veracity guarantees are imposed or required by law, in this industry, respectively, there is quite simply, very little incentive given to supplement manufacturers/distributors, to be so honest, and actually prove it. The only incentive you can give them is your business. There are companies that do the right thing in the supplement industry, and more are taking note and moving in that direction, because a growing segment of their customer base demands it, with their business. So, what is a guy looking for a deal to do? Try to purchase only supplements from manufacturers that DO verify their products' contents, or even better, verify and standardize the principle constituents of their products, as much as you can reasonably afford to do so. Also, attempt to purchase the remainder of your supplements from many of the large manufacturers that are starting to move in the direction of accountability, and withold your business from those who abstain from any semblance of accountability, and the few that are actually moving their companies ideology and practices in contravention of the concept of accountability... i.e. Healthee Oregeons

How can i see "3rd party lab tested for high quality" as you advertise? any proof of what you sell here?

I'm a bit uncertain what it is you want to see. There's the certification mark on the label stating lab tested and purity and potency. I think if you wish detailed information, the company and/or vendor would be able to help you.

Has anyone asked for the COAs for this product?

You should be able to email us n will be gladly to help you

what source is the quercetin from?

I don't know, since it is found naturally in some fruits, grains and vegetables I would think those may be possible sources. I buy it for the Pterostilbene and this brand is a good value.

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Reviews

P**K

my go-to antioxidant

A really great formulation and 200mg per serving in 2 capsules, non-GMO and gluten free. Pterostilbene helps with mental focus and clarity, healthy brain function and cardiovascular health. It's been shown to be more effective than resveratrol. Optimally I've read that 240mg is the ideal amount when combining with NAD supplements so it's close. From NIH - "Substantial evidence suggests that pterostilbene may have numerous preventive and therapeutic properties in a vast range of human diseases that include neurological, cardiovascular, metabolic, and hematologic disorders. Further benefits of pterostilbene have been reported in preclinical trials, in which pterostilbene was shown to be a potent anticancer agent in several malignancies [5]. Pterostilbene is structurally similar to resveratrol, a compound found in red wine that has comparable antioxidant, anti-inflammatory, and anticarcinogenic properties; however, pterostilbene exhibits increased bioavailability."

21.07.2020

B**A

3rd bottle and going! Amazing stuff

Forget the reviews. Do yourself a favor and research: Google or chatgtp what are the health benefits of consuming this supplement. I do consume another supplement of transresveratrol since this product doesn’t contain enough. You’re welcome!

17.01.2025

K**S

De buena calidad

23.12.2025

S**E

Good supplements.

My Latest purchase naturebell Pterostilbene With Quercetin , for heart health and energy ,i lyke there product , it seems work. there krill oil soft gel is also a good product, Right now they offering a free bottle of the Pterostilbene, if the for fill there promas and honest about it? I will keep buying there Supplements . Thank you Steve Szabo

28.05.2021

A**R

wonderful blueberry pills, great quality

So happy to find these pills to help with my healing process. Fast service and great value

14.02.2024

R**A

Lot of promise

It’s a little too soon. I haven’t even opened the bottle yet. Try me again in about three months.

10.01.2026

D**T

Great

Love this product I have energy and feel better

4.07.2025

Q**.

Important to me

This ptersboline is good for what you pay . I like that it works great on me. Is really good on pain relife . I have a few weeks with this and its shown results for me so far . also to let you guys know its easy to swallow for those that have a hard time swallow ing them .

30.10.2019

R**Y

Excelente

5.08.2024

ASIN	B07GCBWB83
Best Sellers Rank	#38,040 in Health & Household ( See Top 100 in Health & Household ) #87 in Resveratrol Nutritional Supplements
Customer Reviews	4.6 4.6 out of 5 stars (623)
Date First Available	November 10, 2017
Is Discontinued By Manufacturer	No
Manufacturer	NatureBell
Package Dimensions	4.45 x 2.4 x 2.4 inches; 2.08 ounces

Pterostilbene with 98% Trans-Resveratrol, 200mg Per Serving, 200 Capsules | Naturally Sourced from Wild Blueberries – Antioxidant Supplement for Healthy Aging Support – Non-GMO

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