Health Queries about Cipcal D3 60000IU Granules 1gm

I'm 45 years old and my Vitamin D level came back at 21 - will this Vitamin D3 60,000 IU granules sachet help correct it?

A level of 21 does suggest insufficiency, and a high-dose sachet like this one is commonly used to correct it, usually taken weekly or biweekly for a set number...