Let your facial hair grow uninterrupted for at least 4–6 weeks
Shave or trim only the areas outside the moustache line
Eat a balanced diet with enough protein, iron, zinc, and vitamins
Sleep 7–9 hours each night
Exercise regularly to support healthy hormone levels and circulation
Reduce stress as much as possible
Keep your skin clean and moisturized
Exfoliate your upper lip area gently 1–2 times per week
Avoid smoking and limit alcohol
Stay hydrated
Use a beard or moustache oil to keep hair and skin healthy
Trim the moustache shape only after it has filled in enough
Be patient, since growth rate is mostly determined by genetics
Consult a doctor if you suspect a hormone or health issue affecting growth