Vitamin D supplements are available as 1000units, 2000 units daily tabs or 60000units capsule weekly once.
You can give 60000units capsule once weekly for 8weeks. Measure vitamin D values after 8weeks.
Next Steps
I also recommend Injection Arachitol - 6,00,000 units give intramuscularly for 1 dose.
Health Tips
Cod
liver capsules also easily available
Vitamin D supplements but they are non vegetarian source .