Is the quality/genuineness of this product all based on buyer reviews, or there is some other way to compare one brand against another?

I suppose the only way to compare would be for you to buy different brands and try them. However, I have found this company’s products to be very good. If you look at the description it is third-party tested. You get 120 capsules which equals 60 servings but it allows the dosage to be split morning and night. The ones I checked have more “other ingredients“ than this company. Right now, I think it’s running 8 cents a capsule and I think that’s a pretty good buy!

Seller or anyone who knows for sure: is this third party tested for heavy metals & arsenic? tia

I can not say for sure about the testing for heavy metals & arsenic. But it does state following...."Third Party Tested: Double Wood's Benfotiamine 300mg is Third Party tested for Potency" as well as "Manufactured and Tested in the USA, Non-GMO, Gluten Free, Vegetarian Safe: DoubleWood's Benfotiamine Capsules are Manufactured and Tested right here in the USA, are Non-GMO, Gluten Free, and safe for Vegetarians" Also I'm just the user of the product maybe reach out to the company itself for more answers. So far I have been very happy with this product.

Soy is not listed as an ingredient. It contains rice flour as a filler and hypomellose vegan capsule. I chose this one because it had the least added ingredients. No other ingredients are stated on the bottle, but to be absolutely sure contact the manufacturer.

Are the ingredients made in America?

According to Google search ingredients are made in USA

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Description

⚡ Elevate your brain & body game with next-level thiamine!

TWO MONTH SUPPLY - 120 capsules provide 60 servings, perfect for daily split dosing.
CLEAN CONSCIOUS - Made in the USA, Non-GMO, gluten-free, and vegetarian-friendly for mindful wellness.
SUPERIOR ABSORPTION - Up to 5x more bioavailable than standard thiamine for maximum effect.
NEURO BOOSTING POWER - Supports nervous system & cardiovascular health with a potent 300mg dose.
CLINICALLY VERIFIED QUALITY - Third party tested to guarantee purity and potency you can trust.

Double Wood Supplements Benfotiamine 300mg delivers a highly absorbable vitamin B1 derivative, clinically third party tested for purity, supporting nervous system and cardiovascular health. Each bottle contains 120 vegetarian capsules, offering a convenient two-month supply of a superior thiamine boost made in the USA with clean, non-GMO ingredients.

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