Topical vitamin D might be more bio-available than oral
Yet another group feels that topical vitamin D is better than oralBoth of their references are on Vitamin D LifeThis is not the current consensus opinion, but may be correctSee also Vitamin D Life* Topical Vitamin D* Topical Vitamin D provides more benefits than oral sometimes - many studies* Search Vitamin D Life for TOPICAL 404 items as of Oct 2015* Spray vitamin D inside cheek in case of emergency Feb 2013* Fastest inside cheek, fast sub lingual, slowest (~12 hours) oral* Topical vitamin D raised blood level to 38 ng (used Aloe Vera gel) – RCT March 2014
TRANSDERMAL VS ORAL VITAMIN D ABSORPTION Health Cloud
The following are the graphics from a 2-3 page article
From Reference #1
Article has the following chart, but does not seem to tell where it came from
References
1. Ruth E. Grossmann. (2010). Evaluation of vehicle substances on vitamin D bioavailability: A systematic review. Mol Nutr Food Res. 54 (8), 1055-1061. in Vitamin D Life Review of bioavailability of vitamin D - oil aprox 2 ng per 100 IU Sept 2010
2. Mir Sadat-Ali. (2014). Topical Delivery of Vitamin D3: A Randomized Controlled Pilot Study. Int J Biomed Sci. 10 (1), 21-24.