Traditional cold remedy; results across trials are inconsistent.
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
30/100Weak
WEAKLIMITEDMODERATESTRONGVERY STRONG
What the evidence supports: cold prevention and duration — results are inconsistent.
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
Short courses of one to two weeks.
Who it's actually for
Adults at cold onset, without autoimmune conditions.
Safe upper limit
Unverified
No formal limit; short courses only
Allergic reactions in people sensitive to ragweed and daisies. Prolonged use is not recommended.