Short courses at the onset of cold or flu symptoms.
TrustedSupp Tier System™ · Tier 3Take as a defined course
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.
Evidence strength
45/100Limited
WEAKLIMITEDMODERATESTRONGVERY STRONG
What the evidence supports: cold and flu duration in small trials.
This scores how well-supported the claim above is — not how much benefit you personally would get. A high score on a narrow claim does not extend to everything the product is marketed for.
How long to take it
A few days at symptom onset, not continuously.
Who it's actually for
Otherwise healthy adults with early cold symptoms.
Safe upper limit
Unverified
No formal limit; short-course syrups and lozenges are typical
Raw or unripe berries and leaves are toxic. Prepared products are fine.