Let your mustache grow for 4–8 weeks without trimming
Avoid shaving or shaping too early
Eat a balanced diet with enough protein, iron, zinc, and vitamins
Stay hydrated
Get enough sleep
Exercise regularly
Reduce stress
Keep the skin under your mustache clean
Exfoliate the upper lip area gently a few times a week
Use a mild beard oil or moisturizer to prevent dryness
Trim only stray hairs after the mustache has filled in
Brush the mustache daily to train hair direction
Be patient and allow natural growth patterns to develop
Avoid smoking and excessive alcohol
Check with a doctor if hair growth is unusually thin or patchy