Do any ingredients come from China? (Yes/No)

Because it is proprietary and confidential business information, Thorne does not disclose the country of origin of its raw materials. Thorne tells us: "Thorne Research sources its ingredients from around the world. However, what is much more important than the country of origin of an ingredient is the testing that is done on that ingredient when it is received by the manufacturer. Thorne Research does not rely on the Certificate of Origin from an ingredient supplier. Instead, Thorne Research tests every single ingredient in our own in-house laboratory, regardless of the ingredient's country of origin, to verify the ingredient's identification, purity, and quality." If you would like more information, we suggest you contact Thorne Customer Service directly at 800-228-1966.

Where is this manufactured? I understand the final step of the process is in the US, but prior to that?

Thorne does not reveal the country of origin of a raw material because that business information is both confidential and proprietary. To disclose the country of origin of a raw material would provide an unfair advantage to our competitors because of the ongoing competition for reliable sources of high-quality raw materials. However, every incoming raw material, no matter its country of origin, is initially quarantined at Thorne, during which time it undergoes rigorous quality assurance processes. These quality assurance processes include microbiological analysis, testing for solvent residues, and screening for pesticides, heavy metals, and other suspected contaminants. Thorne cares deeply about where we source our raw materials. Our research and development team sources ingredients from around the world, and we make every conceivable effort to maintain supply chain transparency from the country of origin to our facility in South Carolina. Thorne partners only with suppliers of ingredients and components whose practices emphasize quality, science, integrity, and responsibility. Premium raw ingredients mean better potency, better absorption, and better digestibility of the final product – and ultimately better health.

How big is the capsule? Is it hard to swallow?

Thorne Research - Glycine capsule is .854 inches in length.

Is there corn in this??

No. Thorne’s Glycine does not contain corn.

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Reviews

S**O

It works for sleep

Good stuff. I’m pleased with the effects of glycine. Undeniable better night sleep.Thanks

11.01.2026

1**I

High-Quality Glycine

Glycine is known for supporting sleep, calming the nervous system, and even helping with collagen production and detoxification and this supplement seems to deliver on all of those

8.08.2025

W**A

Thorne has great products and their glycine doesn't disappoint!

We love Thorne Glycine (all of their products) are great product. Glycine helps me fall asleep quicker/easier.

16.01.2026

A**R

Helps Sleep

Helps my sleep. I still wake up for the bathroom several times but go right back to sleep

3.02.2026

B**.

Works but with caveats

Glycine is claming and is a GABA agonist meaning it helps make GABA receptors ore available and thus you calm down. Sometimes I have a paradoxical effect and it stimulates me. Same with Taurine. I take them during the day and I feel really calm.

23.09.2023

C**N

my doctor recommended it. I'm fighting sever RA damage.

seems helpful. when get older it's harder to get protein to your muscles. your body just doesn't use thing right. It's complicated.

27.01.2026

G**R

Seems good, but time will tell.

Seems to be doing what it said it would do… It’s a mistake, though, to think that any one given supplement will be a silver bullet for anything. One must eat cleanly, get some exercise, and stay hydrated.

26.01.2026

K**J

Great product

11.01.2026

A**A

High quality brand. Does what it's promised. Will buy it going forward as it it works.

3.12.2025

S**A

Toll

21.02.2025

M**S

This product works best for me

19.03.2025

F**س

5star

7.11.2023

S**S

After megadosing 5 grams of glycine a day, I noticed immediate pain relief from my bones after 3 days of taking them consistantly with my Bovine Collagen Peptides. I would recommend looking into medication interactions before taking glycine yourself.

15.11.2025

ASIN	B000VYRROC
Best Sellers Rank	#4,347 in Health & Household ( See Top 100 in Health & Household ) #69 in Amino Acid Nutritional Supplements
Customer Reviews	4.6 4.6 out of 5 stars (1,243)
Date First Available	September 13, 2007
Is Discontinued By Manufacturer	No
Item model number	SA512
Manufacturer	Thorne Research
Product Dimensions	2.89 x 2.89 x 5.22 inches; 7.83 ounces

Glycine - Amino Acid Support for Relaxation, Detoxification, and Muscle Function* - 250 Capsules

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