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Yes, some healthy 17-year-olds can use creatine with a doctor’s advice and adult oversight once basics like training, food and sleep are in place.

No, six hours of sleep is not enough for most adults, though a few cope with it while many feel and function better with at least seven.

Yes, a calorie deficit can leave you tired when you cut too many calories, lose muscle, or miss out on carbs, fluids, and needed nutrients.

No, a healthy 15-year-old should skip creatine supplements unless a doctor gives clear medical reasons and close supervision.

No, teens should avoid creatine unless a doctor who knows their health and sport history has set out a supervised plan.

Yes, many men in their sixties can still get firm erections, especially with healthy habits and medical treatment when needed.

Yes, many 16-year-olds can use protein powder in small amounts when food comes first and a health professional guides the choice.

Many men in their mid-70s can still have firm erections, especially with good health, patience, and the right medical care.

Yes, many men in their seventies can still have firm erections when health conditions are managed and sexual stimulation is strong.

Yes, a B12 deficiency can contribute to hair thinning and shedding, but other nutrient gaps and health issues often matter just as much.