Hair loss has many causes - DHT-driven pattern loss, stress-related shedding, nutritional deficiencies, and more. Gentle hair care, stress reduction, correcting deficiencies, and some botanical options may help, but see a clinician for diagnosis and to discuss proven medical treatments.
Female hair loss has many causes - genetic, hormonal, medical, and nutritional. Modern evaluation focuses on identifying reversible factors; treatments include topical minoxidil, oral antiandrogens, PRP, low-level laser therapy, and reconstructive options when appropriate.
Thinning hair has many causes. Thickening shampoos mostly add temporary volume by coating strands and cleaning the scalp. For true regrowth, see a clinician and consider evidence-backed treatments like topical minoxidil.