What is DSIP?
DSIP is a peptide made of nine amino acids. Swiss researchers isolated it in the 1970s from the blood of rabbits that had been put into deep sleep by electrically stimulating a part of the brain called the thalamus. When the peptide was given to other animals, researchers reported an increase in delta waves, the slow brain waves of deep sleep. That is where the name comes from.
DSIP-like material has since been detected in the brain, blood and other tissues of animals and people. Yet researchers have never identified a gene or a larger protein that DSIP is made from, or a receptor that it clearly acts on. Reviews have described DSIP as an unresolved puzzle.
How does DSIP work?
No one knows for sure. Because no specific receptor has been found, its effects may be indirect. Animal studies have suggested links to several systems involved in sleep and stress, including GABA, serotonin and the stress-hormone system. DSIP also breaks down quickly in the blood, and researchers have debated how much of it reaches the brain when it is given from outside.
What has research looked at?
- Sleep in animals
- Early studies in rabbits, rats and other animals reported more slow-wave sleep, but later studies did not always reproduce this, and results depended on timing and conditions.
- Insomnia in people
- Small human studies, mostly in the 1980s, looked at chronic insomnia. Some reported better sleep, while other controlled studies found little or no difference from placebo.
- Withdrawal symptoms
- Small, mostly uncontrolled studies looked at DSIP in people going through alcohol or opioid withdrawal and reported fewer symptoms. Without proper controls, these results are hard to interpret.
- Stress and hormones
- Animal studies reported effects on stress responses and on several hormones, including stress and reproductive hormones. These findings were inconsistent and have not been well confirmed.
Overall, the evidence is weak. Most research is decades old, the human studies were small, and there has been little modern clinical work. Claims that DSIP raises growth hormone or testosterone are not well supported in people. Even basic questions, such as where DSIP comes from in the body, remain open.
Side effects and cautions
The small human studies described few side effects, but they were too small and short to detect uncommon or long-term problems. Informal reports describe headache, dizziness and grogginess, and sometimes worse sleep rather than better. Long-term safety is unknown. Ongoing sleep problems can have causes such as sleep apnea, depression, thyroid problems or medicines, so it is worth getting them assessed. A qualified clinician can help find the cause.
- Other sleep medicines and alcohol
- How DSIP interacts with sleep medicines, sedatives or alcohol has not been studied well.
- Unclear mechanism
- Because its target is unknown, it is hard to predict effects in people with other health conditions.
- Pregnancy and breastfeeding
- There are no safety data for pregnancy or breastfeeding.
Further reading
This page summarizes the research in plain words. To read the studies yourself:
- Published studies on DSIP PubMed, US National Library of Medicine
