Glycine from Double Wood Supplements is a daily supplement that supports sleep quality, mental clarity, and liver and kidney health, thanks to the key amino acid L-glycine.

Benefits & Features:

• Helps you sleep better for a refreshed morning
• Glycine supports mental clarity and daytime performance, helping you think clearly after restful nights
• Designed for daily use as part of a simple wellness routine
• Manufactured in the United States to good manufacturing practice standards with third party testing for purity
• Better sleep quality and daytime focus come from glycine's calming action, helping you drift off quicker and feel sharper the next morning and all day long

Double Wood Supplements has built a reputation for purity and transparency. Glycine is produced in the United States under GMP guidelines, with non-GMO gluten-free ingredients and rigorous third party testing for microbes and heavy metals. Certificates of Analysis are publicly accessible, showing the brand’s commitment to quality you can verify. This single-ingredient formula keeps things simple and straightforward, ideal for anyone who wants a trusted amino acid boost without extra fillers. For those seeking additional support, this vitamin d supplement can pair well with magnesium glycinate or creatine as part of a balanced routine.

United Kingdom Shipping:

Orders placed by 2pm (Monday to Friday) are dispatched the same day. Orders placed after 2pm will be dispatched the next working day.

Free shipping on orders over £50 to the UK.

Returns: Our products are meant to make you feel healthy and at your best. If you need to return your item, you can do so free of charge within 30 days in the same original and unopened packaging. Subject to T&C's.

Please consult the product packaging for accurate instructions on how to use the product.

The Active Ingredient Is: Glycine

Glycine is a simple amino acid that serves as a building block for proteins and participates in normal bodily functions.

This form is L-Glycine, a naturally occurring amino acid used in dietary supplements to support sleep quality, cognitive clarity, and liver and kidney health.

What Does Glycine Do?

Glycine is involved in supporting sleep quality and daytime mental performance, with studies indicating improvements in subjective sleep quality and next-day alertness.

EFSA-recognised roles include supporting normal metabolism and cognitive function, as glycine contributes to these physiological processes in healthy individuals.

*This product is not intended to diagnose, treat, cure, or prevent any disease.

Double Wood Supplements is recognised for its strong manufacturing stance and commitment to purity, making it a trusted partner for Welzo. The brand’s USA-based facilities follow GMP standards and prioritise transparency, with third-party testing for microbes and heavy metals and publicly accessible Certificates of Analysis to demonstrate product integrity.

Welzo’s medical team evaluated Double Wood Supplements Glycine and confirmed its clear sourcing story, non-GMO and gluten-free formulation, and emphasis on purity. This aligns with our rigorous quality criteria and improves confidence in routine supplementation, which we reflect in our partnership approach. You can learn more about how we verify quality through our quality certification process and the expertise of our medical team.

For this product, the brand’s single-ingredient glycine offering is manufactured in the USA with transparent public testing, reinforcing its suitability for Welzo customers seeking a reliably controlled supplement. This combination of credibility, measurable quality, and product clarity supported our final selection of Double Wood Supplements as our chosen partner for Glycine.