Topical application is limited by the stratum corneum barrier, with near-zero penetration through intact skin (Li et al., 2015)
Many adults can focus on reaching a reasonable daily intake of vitamin D through food, sunlight and modest supplements, without testing levels first, as long as they do not have specific risk factors
If doing injections at home, always remember to properly dispose of any needles and syringes in a sharps container or well-sealed heavy plastic container
Such reactions are generally mild and resolve within a few days
See: Perinatal Services BC (PSBC) www.perinatalservicesbc.ca Perinatal Services BC (PSBC) provides leadership, support, and coordination for the strategic planning of perinatal services in British Columbia and is the central source in the province for evidence-based perinatal information