Schlafbeere, literally sleepberry, is a German name for ashwagandha, Withania somnifera. The name does not mean that every product is a tested sleep medicine. Root powder, tea and different extracts can vary considerably in their composition.
What research shows about sleep and stress
NCCIH identifies evidence of possible effects on insomnia and stress for some preparations studied. Many studies were small and used different products. Results for a particular extract therefore cannot be applied to every capsule, every tea or years of use. The evidence for relieving anxiety symptoms is unclear.
Check the specific preparation before taking it
A comparison should include the plant name, the part used, extract details and other ingredients. A high milligram amount or withanolide content alone does not demonstrate benefit or safety. BfR was unable to derive a safe intake level from the available data.
Risks and interactions
Possible adverse effects include drowsiness and gastrointestinal symptoms. There are also reports of liver injury associated with ashwagandha preparations. Thyroid function, existing conditions and medicines need to be considered; interactions may involve sedatives and thyroid medicines, for example.
BfR particularly advises children, pregnant or breastfeeding people and those with liver disease against using it. Choosing a smaller portion yourself does not automatically resolve such a risk situation. If new symptoms develop, do not continue experimenting with the preparation on your own; jaundice or marked deterioration need prompt medical assessment.
Do not address sleep problems with a product alone
Record the course of symptoms, sleep times, other supplements and medicines for a consultation. Persistent sleep problems or severe psychological symptoms should be assessed for their underlying causes. Do not replace prescribed treatments with a herbal product.
Frequently asked questions
Are tea and extract equivalent?
No. The preparation, plant part and composition may differ.
Does an amount used in a study provide a personal dosing plan?
No. The product, participants, duration and personal circumstances all matter when interpreting the result.
Read more: Ashwagandha amounts and extract information and Putting ashwagandha and testosterone into perspective.
Sources
General information, not individual treatment or dosage advice.
