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Onion juice is effective or not effective it depends upon individuals.First you go for routine investigation.Correct defficiency if any reported.Take muti vitamin medicines.
Use proper hair oil and shampoo.Do regular gentle massage
of oil in the scalp
Dont keep your hair dry for long time.Eat healthy diet,drink enough liquids.
Hair loss due to heredetary,hormonal
factor is dificult to control.for that consult dermatologist
for better medical management.