Check before you startThis one has documented interactions with medication classes where the consequences are serious. If you take any prescription medicine, run it past a pharmacist before starting.
How long to take it
Twelve weeks to judge skin effects.
Who it's actually for
People interested in skin photoprotection, with modest expectations.
Safe upper limit
UnverifiedNo formal limit; 4–12 mg daily in trials
Well tolerated. Very high intakes can tint the skin slightly.
No source attached yet. Treat this as a starting point, not a citation, until reviewed.
Interactions to know about
- Blood pressure medication — Beta blockers, calcium channel blockers, ACE inhibitors
- Blood thinners / antiplatelets — Warfarin, apixaban, rivaroxaban, clopidogrel, aspirin
Other supplements:
Run your full list through the interaction check.
Practical notes
- Take with fat.
- Mild blood-pressure and blood-thinning effects at higher doses.