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4Optional

Apple cider vinegar

Also sold as ACV, acetic acid

Popular for weight and blood sugar; effects are small and the dental cost is real.

4TrustedSupp Tier System™ · Tier 4Take by choice, or not at all
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

No established course.

Who it's actually for

Little justification. Glucose effects are small and short-lived.

Safe upper limit

Unverified
1–2 tbsp diluted per day; never undiluted
Erodes tooth enamel and can burn the oesophagus if taken neat. Lowers potassium with prolonged high intake.
No source attached yet. Treat this as a starting point, not a citation, until reviewed.

Interactions to know about

  • Diabetes medicationMetformin, insulin, gliclazide, SGLT2 inhibitors
  • Diuretics (water tablets)Furosemide, bendroflumethiazide, spironolactone
  • DigoxinHeart rhythm medication
  • Acid blockersOmeprazole, lansoprazole, famotidine

Other supplements:

Run your full list through the interaction check.

Practical notes

  • Always dilute and rinse your mouth afterwards; use a straw.
  • Gummies deliver far less acetic acid than the label implies.
  • Can lower potassium — relevant with digoxin or diuretics.