Short answer: Patanjali Shatavari Churna may boost general vitality but is unlikely to produce meaningful weight gain on its own; check with a doctor before starting given your weight of 39 kg.

💊 Product & dosage

• Product: Contains Shatavari (Asparagus racemosus); marketed for vitality, debility, and reproductive health.
• Typical dose (product info): 2–5 g twice daily mixed with warm milk or water.
• Effect on weight: Limited clinical evidence that Shatavari alone causes weight gain; it may support appetite/energy in some people.

🏥 Practical next steps

• See a doctor (physician) to rule out medical causes of low weight and confirm safety before starting the churna.
• Get basic tests if advised (e.g., complete blood count, thyroid‑stimulating hormone (TSH), and blood glucose).
• Nutrition first: work with a registered dietitian for a calorie‑dense, protein‑rich plan; supplements help only alongside diet.
• If cleared, start the churna at the product dose mixed with milk for added calories and monitor response for 4–8 weeks.

⚠️ Warnings / when to stop

• Allergic reaction: rash, swelling, difficulty breathing—stop and seek urgent care.
• Hormonal effects: if you develop new menstrual or breast changes, stop and see your doctor.
• Drug interactions/conditions: avoid if pregnant/breastfeeding or on hormonal/immunomodulatory drugs until cleared by a doctor.

🩺 FOLLOW_UP (please answer these so I can be more specific)

• What is your height (so body mass index, BMI, can be estimated)?
• Are you pregnant or breastfeeding, or taking any medications?
• Do you have any medical conditions or allergies?

If you want, I can explain how to increase weight safely or calculate your BMI after you share your height.