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One 8.4-oz (250-ml) Red Bull has 80 mg caffeine; larger cans range from 114–198 mg.

Most adults train well with 1–3 mg/kg (about 70–200 mg) of pre-workout caffeine taken 30–60 minutes before exercise.

Most healthy adults can have about 400 mg of caffeine per day; pregnancy and teens need lower limits.

Daily biotin needs are 30 micrograms for most adults; milligram doses exceed typical needs and can skew some lab tests.

Most adults use 900–1,500 mg of berberine per day, split into 2–3 doses with meals; avoid in pregnancy and check medicines for interactions.

For ashwagandha dosing, 250–500 mg extract daily is common; many trials use 300 mg twice daily for stress, short term (≤3 months).

Yes, short-term ashwagandha use is generally safe at 120–600 mg of standardized extract daily, with root powder often 3–6 g.

One compact fluorescent bulb typically contains about 3–5 mg of mercury, sealed in the glass and varying by brand and year.

Zero—standard incandescent lamps contain no mercury; CFLs and other fluorescents do, in small milligram amounts.

A standard fluorescent tube holds about 3–15 mg of mercury; newer low-mercury T8/T5 lamps average near 1–3 mg while older T12 lamps run higher.