15 mL, meaning two tablespoons equal about 30 mL.
For some people, that amount may cause gastrointestinal irritation.
## Who Should Be Especially Careful?
Apple cider vinegar may not be appropriate for everyone.
Extra caution is sensible if you have:
* Frequent acid reflux
* A history of stomach irritation
* Gastroparesis
* Kidney disease
* Problems with potassium levels
* Diabetes treated with medication
* Regular use of medications that affect electrolytes or blood sugar
If you take prescription medications regularly, ask a doctor or pharmacist before making concentrated vinegar drinks part of your daily routine.
## Lemon
