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Ingredient guide
Glycine: evidence, dose and safety
Glycine is the smallest amino acid. The body makes it, and it is plentiful in collagen-rich foods. It tastes slightly sweet.
At a glance
- Strongest evidence
- C Limited
- Dose in our plans
- 3 g a day for adults
- Adult upper limit
- 6 g a day from food and supplements together
- Safety checks
- 0 situations and 0 medicine or supplement interactions, checked against your answers in every plan
- Reviewed
- Atrum Labs clinical team (MD, PhD), November 2026
What the research looked at
Each line is one body of research, graded A (strong) to D (weak). How we grade evidence. What each study measured is explained in your personal plan.
| Grade | Who was studied | References |
|---|---|---|
| C | Adults with poor sleep |
|
How much
- Our plans usually use 3 g a day for adults. The exact dose depends on your lab results, age and medicines.
- Adult upper limit: 6 g a day from food and supplements together. Source: Sleep trials used 3 g a day (Yamadera W et al. 2007); 6 g is a conservative ceiling.
- Children's doses are set by age, and some ingredients are for adults only.
Products with Glycine
Written and reviewed by the Atrum Labs clinical team (physician-scientists, MD, PhD) from our clinical knowledge base, version 0.2.0-draft. This page is general information, not medical advice. Food supplements are not a substitute for a varied, balanced diet and a healthy lifestyle.
See if it belongs in your plan