Supplement safety is often discussed in very general terms, but in practice the risks depend heavily on the individual. A supplement that is reasonable for one person may be inappropriate for another based on their medications, health conditions, dose, formulation, or the other products they are already using.

This becomes especially important when supplements interact with medications or underlying medical conditions. Some interactions can change how a drug is absorbed, metabolised, transported, or cleared from the body. Others can amplify or oppose the drug's clinical effect, such as increasing sedation, lowering blood pressure or blood glucose, or affecting bleeding risk.

In this episode, Giulia Guerrini, a GPhC-registered pharmacist and researcher at Examine, talks about how clinicians and practitioners can think more systematically about supplement safety, side effects, contraindications, and drug–supplement interactions.

Timestamps:

• [02:39] Interview start
• [05:21] Why context matters
• [06:38] Timing and formulation
• [12:58] Rating interaction risk
• [22:39] Berberine benefits and interactions
• [27:33] Adaptogens quality concerns
• [30:15] Melatonin safety questions
• [36:30] Stacking supplements risks
• [41:50] Quality control and regulation
• [55:35] Key ideas segment (premium-only)

Links:

• Free trial of Examine Clinician Edition – For health & nutrition professionals. Includes the Supplement Navigator (safety and interaction checking), plus all other Examine tools (study summaries, supplement database, in-depth guides, etc.)
• Free trial of Examine+ – For anyone wanting to make evidence-based decisions about supplements and health. Includes: 100+ study summaries a month. The full supplement database. In-depth guides. ExamineAI. Doesn't include the Supplement Navigator.
• Go to episode page
• Subscribe to Sigma Nutrition Premium