MAJOR — Use With Caution
DANGEROUS — contraceptive failure risk
Evidence level: STRONG
Charcoal can absorb your birth control pill, making it less effective — you could get pregnant.
Activated charcoal adsorbs oral contraceptive hormones, potentially reducing absorption enough to cause contraceptive failure.
Take birth control pill at least 2 hours before or 4+ hours after charcoal. Use backup contraception (condoms) if charcoal taken within 2 hours of pill. Consider non-oral contraception if using charcoal regularly.
Take Combined Oral Contraceptives at the same time daily. Activated Charcoal at any convenient time. Hormonal contraceptives can deplete B vitamins, magnesium, and CoQ10 — supplementation may be beneficial. No major timing interaction with most supplements.
Regular charcoal use, timing close to pill
Unintended pregnancy, breakthrough bleeding (warning sign)
Discuss non-oral contraception if using charcoal regularly. Use backup method when in doubt.
Some substances can reduce contraceptive effectiveness. Use backup contraception if adding a known CYP3A4 inducer. Discuss with your gynecologist — IUDs and injections are not affected by enzyme-inducing interactions.
Charcoal can absorb your birth control pill, making it less effective — you could get pregnant.
Take Combined Oral Contraceptives at the same time daily. Activated Charcoal at any convenient time. Hormonal contraceptives can deplete B vitamins, magnesium, and CoQ10 — supplementation may be beneficial. No major timing interaction with most supplements.
Unintended pregnancy, breakthrough bleeding (warning sign)
Some substances can reduce contraceptive effectiveness. Use backup contraception if adding a known CYP3A4 inducer. Discuss with your gynecologist — IUDs and injections are not affected by enzyme-inducing interactions.
Discuss non-oral contraception if using charcoal regularly. Use backup method when in doubt.
Or browse the full interaction database (121,000+ pairs).