There is no single best time for everyone to take psyllium. The best time is the one that suits your meals, water intake and routine.
Morning works for people who like a clean daily habit. They mix psyllium husk in water, drink it promptly and continue with breakfast. Night works for people who prefer a calmer routine after dinner. Some take it before a meal for fullness, but this should be done carefully and with enough water.
The Indian routine matters. If mornings are rushed, you may mix badly and create clumps. If nights are late and heavy, you may forget water. If you take thyroid tablets, diabetes medicines, cholesterol medicines or other regular medication, ask your doctor about spacing. Many people keep fibre supplements away from medicines by a few hours for safety.
Do not choose timing by trend. Choose it by consistency. Pick a slot where you can use a full glass of water, stir properly and not hurry the drink.
Also listen to your stomach. If one time causes discomfort, try another.
Psyllium is a routine product. The clock matters less than correct use, enough water and steady repetition.
Pick the time of day when you can actually give it a full glass of water and a proper stir. That slot matters more than the clock.