Seller: what is the difference between copper glycinate and copper bisglycinate?

Copper bisglycinate is the same as copper glycinate. Copper bisglycinate is the more accurate way to describe this compound, which is copper attached to two glycine molecules (bis = 2).

Are all sources of all ingredients, both inactive and active, 100% vegan or vegetarian or neither?

Copper Bisglycinate is not vegan because it contains leucine as one of its “Other Ingredients.” Leucine is derived from keratin, a type of animal protein.

Is this manufactured in the USA?

Thorne products are manufactured in South Carolina, USA.

Does this have USP certification?

USP verification is a service provided for a fee to nutritional supplement companies – mostly health-food store brand companies. Thorne has its own much more extensive verification process. Although all of Thorne's supplement ingredients comply with USP standards for the supplement industry, Thorne does not pay for the USP logo to be placed on their products. Thorne Research is 100-percent compliant with the Good Manufacturing Practice regulations enforced by the U.S. Food and Drug Administration for the nutritional supplement industry. Thorne’s internal standards for ingredient purchasing, product specifications, and manufacturing standards for finished products is unsurpassed. For example, Thorne products are approved for sale in Australia by the Therapeutic Goods Administration of the Government of Australia, a regulatory agency that does not distinguish between pharmaceutical products and nutritional supplement products. Thorne’s manufacturing facility is also regularly audited and certified by NSF International – which is necessary to have NSF Certified for Sport products.

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Reviews

D**R

Great supplement

Thorne makes great supplements. I use this and a few others. Lab results show improvement.

14.11.2025

J**E

Great product

It's a great product.I take it twice a day

16.10.2025

A**M

Pair with zinc for best results

Easy to swallow and excellent to take along side zinc.

11.11.2025

B**N

Doesn’t hurt my tummy.

only copper that doesn’t hurt my stomach! with or without food. i’ve been taking for 6 months (lol) no sign in my copper increasing on my bloodwork but that’s because i *now know thanks to this pill* that i have an absorption issue. will continue taking while eating gf (

2.12.2025

A**.

Beneficial if not included in your multivitamin.

They are small ! Capsules and therefore easy to swallow. Copper is good for your body, but is highest in food one does not eat every day: Oysters, Lobsters, Organ meats dark chocolate and Shiitake mushrooms.

4.08.2025

S**A

This is my last review of this product

Great! I've been using this supplement for years - that says it all.

19.11.2025

O**A

Like it

This is my 4th bottle. Use it since my ferritin and copper are low within the normal range. It is working. Easy to swallow.

13.07.2025

G**.

A little pricey

I take it every day

6.11.2025

R**E

These seem great so far. Delivered quickly.

2.08.2023

M**E

Good Product.

10.07.2025

J**A

llego en buen estado y rapido

4.09.2024

N**O

Excelente producto, tienes que comer proteína animal para no vomitar, pero en las últimas 3 semanas el precio incrementó entre un 30 a un 50%, ¿qué pasó? Fue de tener un precio normal a uno completamente exagerado en 3 semanas. Hasta acá sonó el rugido de tripas. Si no bajan el precio vamos a tener que cambiar de marca.

6.03.2025

R**N

I tried having a snack then having this and it just messed up my stomach. I threw up, multiple times. You need to eat a heavy meal before taking. Also, if its only one capsule per day, it would be better. Its just a lot of work to eat 2 heavy meals a day and to remember to take them.

26.09.2024

THORNE - Copper Bisglycinate - Well-Absorbed Trace Mineral Supplement - 60 Capsules

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