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No, brushing your teeth doesn’t break a fast when you avoid swallowing toothpaste; religious fasts permit it with care to prevent ingestion.

Yes, creatine can fit into a water fast for training, but strict water-only fasts and medical fasts call for skipping it.

No—plain calcium supplements are non-caloric, so most won’t break a fasting window; sweetened chews or milky tablets can.

Yes, plain creatine has no calories, so during a 3-day water fast you can take it—use unflavored powder, skip carb mixes, and drink ample water.

Yes—DayQuil can align with some fasting plans, but sugary liquids break a calorie fast; pick gel caps with plain water if you need symptom relief.

No. Diet pills during intermittent fasting add safety risks and can break the fast.

Yes, you can take Excedrin during calorie fasts, but aspirin and caffeine can irritate an empty stomach; follow pre-op or lab fasting instructions.

Yes, zero-calorie fat burner capsules can fit within intermittent fasting, but skip formulas with calories or “take with food” directions.

Yes, fish oil breaks a strict fast because it contains calories; take it during your eating window or only if your plan allows fats.

No, garcinia during a strict fast isn’t advised; safety is uncertain and some formats add calories that can derail fasting goals.