Vitamin D, Vitamin B12, etc. charts- 2004-2018
VITAMIN DEFICIENCY – HEALTH TRENDS: A REPORT
Amazon free for Kindle Unlimited, Published Jan 2019

Provides ZERO information as to the source of the data
Does trend = % of population?
Vitamin D

Deficiency of Vitamin D category listing has items along with related searches
Vitamin D levels have been crashing since 1995 (Polish Children, Elite Military, etc)
Reasons for children having low vitamin D (proposed by 10 societies) - May 2018
Vitamin D levels are lower than 20 ng in half of the world – Dec 2017
3X increase in UK children who are vitamin D deficient in just 5 years – Nov 2015
Vitamin B-12

Vitamin B12 category listing has items along with related searches