L-cysteine supplements and blood sugar control in type-2 diabetes
What it found
Whey protein rich in cysteine improved how the body handles sugar in diabetic animals and people with type-2 diabetes.
L-cysteine itself also helped sugar metabolism in animal studies.
What they found
Animal and lab studies
L-cysteine in animals
In animal studies, giving L-cysteine or related molecules improved sugar metabolism.
Studies in people and animals
Whey protein and blood sugar
Whey protein rich in cysteine improved how the body processes sugar. This was seen in diabetic animals and in people with type-2 diabetes.
Other findings
How L-cysteine works
L-cysteine can boost the insulin-related chemical signals that help the body process sugar.
What the authors conclude
- They say more research is needed to see if L-cysteine truly helps control blood sugar in people with diabetes.
- They also call for studies on whether it reduces blood vessel inflammation in these patients.
How it was done
Many people with type-2 diabetes struggle to keep their blood sugar under tight control using current diets and medicines. The authors looked at a low-cost supplement that might help alongside standard treatments.
The authors reviewed existing research on cysteine-rich whey protein and L-cysteine supplements. They looked at studies in both animals and people with type-2 diabetes. They also examined the chemical pathways through which L-cysteine affects sugar handling.
What it can’t tell you
- We summarised it from the abstract only.
- This work gathered past studies rather than running a new trial.
- It cannot prove that taking L-cysteine will lower blood sugar in everyday life.
- More clinical tests are needed before it can be used as an add-on treatment.
Who paid
- Funding
- Funded by NIDDK NIH HHS (from the PubMed record).
- Authors work at
- LSU Health Sciences Center, USA
The paper
- Title
- L-cysteine supplementation as an adjuvant therapy for type-2 diabetes
- Type
- ReviewThe authors read earlier studies and describe what they found. It isn’t a new study.
- Evidence
- Studies in people · animals · lab
- Summarised from
- Abstract only
- Cite
- Jain SK (2012). L-cysteine supplementation as an adjuvant therapy for type-2 diabetes. Canadian journal of physiology and pharmacology. doi:10.1139/y2012-087PubMed 22783875DOI
Summary written 30 Sep 2026. Check it against the paper before it changes what you eat. How we summarise papers · Report an error