There isn't a single best shampoo, as it depends on your scalp type, but several active ingredients work exceptionally well. For moderate to severe dandruff, look for shampoos containing Ketoconazole (an antifungal) or Selenium Sulfide. For milder, daily use, ingredients like Zinc Pyrithione or Salicylic Acid (which helps exfoliate flaky skin) are highly effective. Simply massage the shampoo into your scalp, leave it for 3 to 5 minutes, and rinse thoroughly. Dandruff is a very common, harmless condition that is easily managed. If it doesn't improve after a few weeks, a dermatologist can help you find a targeted strength.

Yes, it can be related. After illnesses like Typhoid fever, the body may go through temporary hair shedding (called telogen effluvium), which can cause increased hair fall for a few months. Dandruff can further worsen hair fall by affecting scalp health. Focus on a nutritious diet (protein, iron, vitamins), use an anti-dandruff shampoo like Ketoconazole, and avoid stress and harsh hair treatments. This type of hair fall is usually temporary and improves with time. If hair fall is severe or continues beyond a few months, consult a doctor to check for deficiencies or other causes.

For your dandruff, I recommend using a medicated shampoo containing generic active ingredients such as ketoconazole, zinc pyrithione, or selenium sulfide. Use it two to three times a week, leaving it on your scalp for about five minutes before rinsing thoroughly. Regarding grey hair, unfortunately, medicated shampoos cannot reverse or treat greying, as it is largely determined by genetics and ageing. However, premature greying can sometimes be linked to nutritional deficiencies, such as Vitamin B12. I suggest consulting a doctor for a simple blood test to check your vitamin levels, and focus on a balanced diet to support your hair health.