Official resources
Fact sheets from the NIH Office of Dietary Supplements related to this ingredient group.
- Cysteine (ClinicalTrials.gov)
- L-Cysteine - Clinical trials (PubMed)
- L-Cysteine - Dose and administration (PubMed)
- L-Cysteine - Adverse effects (PubMed)
- L-Cysteine - Contraindications (PubMed)
- L-Cysteine - Mechanism of action (PubMed)
- L-Cysteine - Kinetics (PubMed)
- L-Cysteine - Poisoning (PubMed)
- L-Cysteine - Dietary supplement use in human (PubMed)
Dietary Supplement Label Database
Ingredient group data in NutriNav is aligned with the NIH Dietary Supplement Label Database (DSLD).
- DSLD group id
- 1135
Compare All Forms
1 formCompare supplement forms of L-Cysteine by absorption quality and what your body actually gets from each:
| Form | Absorption | Steps to absorb | Notes | Action |
|---|---|---|---|---|
| L-Cysteine | — | — | — | View → |
Type: Amino Acids
Building blocks of proteins. Essential amino acids must be obtained from diet, while non-essential can be synthesized by the body.
Absorption: Amino acids are generally well-absorbed. Some forms (like citrulline) are more effective than others (like arginine).
Interactions: Generally safe but high doses can cause digestive issues. Some amino acids can affect neurotransmitter levels.