Short courses only — prolonged high doses cause nerve damage.
TrustedSupp Tier System™ · Tier 2Take until levels correct
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
74/100Strong
WEAKLIMITEDMODERATESTRONGVERY STRONG
What the evidence supports: pregnancy nausea and correcting deficiency.
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
Weeks to a few months. This is not one to take indefinitely at high doses.
Who it's actually for
Specific uses in pregnancy nausea and some medication-induced deficiencies.
Safe upper limit
Unverified
100 mg per day (many European bodies set it far lower, near 12–25 mg)
Sustained high intake causes peripheral neuropathy — numbness and tingling that can persist after stopping.