Vitamin D levels massively changed by CYP3A4 gene (drugs such as Ivermectin and anti-epileptics)

Deactivation of CYP3A4 by drugs such as Ivermectin INCREASE calcitriol and calcidriol (Vitamin D)
Activation of CYP3A4 by drugs such as some anti-epileptics DECREASE calcitriol and calcidriol (Vitamin D)

• Ivermectin raises levels of vitamin D (by decreasing CYP3A4)
• Characterization of CYP3A pharmacogenetic variation in American Indian and Alaska Native communities,
  targeting CYP3A4*1G allele function. -  PDF
• Interplay between Vitamin D and the Drug Metabolizing Enzyme CYP3A4 - July 2014 -  PDF
  • "For example, daily administration of rifampin (anti-epileptic) to healthy volunteers lowered the plasma concentration of 25OHD3 by 70%"
• CYP3A4 mutation causes vitamin D–dependent rickets type 3 - Feb 2018 -  PDF
• Role of vitamin D receptor in the regulation of CYP3A gene expression = Nov 2019 -  PDF

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See also Ivermectin and COVID-19

Genetics category listing contains the following

281 articles in the Genetics category

see also

• 410 articles in Vitamin D Receptor
• 146 articles in Vitamin D Binding Protein = GC
• 38 articles in CYP27B1
• Calcitriol category listing has 52 items
• Topical Vitamin D
• Nanoemulsion Vitamin D may be a substantially better form
• CYP3A4
• Getting Vitamin D into your body

Vitamin D blood test misses a lot

• Snapshot of the literature by Vitamin D Life as of early 2019
• Vitamin D from coming from tissues (vs blood) was speculated to be 50% in 2014, and by 2017 was speculated to be 90%
• Note: Good blood test results (> 40 ng) does not mean that a good amount of Vitamin D actually gets to cells
• A Vitamin D test in cells rather than blood was feasible (2017 personal communication)
•    Commercially available 2019
  • However test results would vary in each tissue due to multiple genes
• Good clues that Vitamin D is being restricted from getting to the cells
  1) A vitamin D-related health problem runs in the family
  • especially if it is one of 51+ diseases related to Vitamin D Receptor
  
  2) Slightly increasing Vitamin D show benefits (even if conventional Vitamin D test shows an increase)
  3) Vitamin D Receptor test (<$30) scores are difficult to understand in 2016
  • easier to understand the VDR 23andMe test results analyzed by FoundMyFitness in 2018
  
  4) Back Pain
  • probably want at least 2 clues before taking adding vitamin D, Omega-3, Magnesium, Resveratrol, etc
    • The founder of Vitamin D Life took action with clues #3&4

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Web

• CYP3A4 Wikipedia
  • CYP3A4metabolizes about half of all drugs: examples include:acetaminophen, codeine, ciclosporin (cyclosporin), diazepam, and erythromycin
  • grapefruit juice ... is a potent inhibitor of CYP3A4, which can affect the metabolism of a variety of drugs, increasing their bioavailability.