There is no universal CBD dose. Product labels state a serving size, and the common-sense convention is to start low and increase slowly while observing how you respond. Concentration (mg per serving) matters more than product volume.
European food-safety assessment of CBD is ongoing: EFSA has set only a provisional intake level for highly purified CBD in food supplements and states that safety cannot currently be established for people under 25, pregnant or lactating women, or people taking medication.
Consult a healthcare provider before using CBD, especially alongside any medication. This page is educational only and is not medical advice.