28 w osteoporosis and spinal fractures low vit d is all that was found! is this what caused it? and can it be reversed if i take my vit d?

Osteoporosis: You are very young to have this. Are you on steroids or have any other medical problems? Have you had bariatric surgery and are non compliant with your supplements? It is important for you to take calcium citrate with vit D3 twice daily, however, you need to see the endocrinologist to make sure you don't have issues with your parathyroid. Good luck, hope you feel better