Hey Cast Iron,
Sorry to be so slow coming to the party. As long as your serum calcium assay remains within its normal reference range there's no hypercalcemia, a.k.a., vitamin D3 intoxication/toxicity.
I've kept my 25(OH)D3 up around 450 nmol/L (180 ng/mL) for quite a while as you can see in the 5-year chart of my lab assays for 25(OH)D3, calcium and PTH..
It's presently up around 680 nmol/L (270 ng/mL) due to Fall/Winter leaf mold spores that trigger allergic rhinitis. After many years watching my assays for serum 25(HO)D3, calcium and PTH, my PCP looks at my 25(OH)D3 assay, smiles and then says, "I have no problem with your 25(OH)D3 this high as long as it helps prevent your CH and your serum calcium remains within its normal reference range."
Mast cells, part of our immune system's family of white blood cells, release large quantities of histamine and other proinflammatory mediators when insulted by allergens. The histamine in turn, triggers neurons and glia within our trigeminal ganglia to express Calcitonin Gene-Related Peptides (CGRP) and other neuropeptides. Neurologists tell us the CGRP expressed within neurons and glia is responsible for the neurogenic inflammation and the pain we know as cluster headache.
The bottom line is histamine to a CHer is like Kryptonite to Superman - Bad News. None of the prevents including vitamin D3 work very well during an allergic reaction. Many CHers, me included, have found a combination of 3,000 mg/day Tumeric (Curcumin), 3,000 mg/day Resveratrol, 6 to 8 grams/day vitamin C (taken in divided doses throughout the day), double the Omega-3 dose and Benadryl (Diphenhydramine HCL) at 25 mg 4 times a day all help block histamine effects and this lets the genetically active vitamin D3 metabolite 1,25(OH)2D3 down-regulate the expression of CGRP, other neuropeptides and proinflammatory mediators.
This cocktail of extra supplements can take as little as a day and up to a week to take effect for some CHers. Others will find it makes their CH less severe and more controllable, like easily aborted with oxygen therapy.
I also use a combination of 100,000 IU/day of Bio-Tech D3-50 and 0.5 mL/day (40,000 IU/day) of the Nutrasal Micro D3 taken sublingual as a loading dose.
The Atkins-Ketogenic Diet can help. Avoid all sugars and fruit juices high in fructose. Avoiding all wheat and grain products can also help. If you do eat grain products, make sure they are Non-GMO. Most wheat and grain products are contaminated with glyphosate, the herbicide in RoundUp.. Ir causes all kinds of problems. As a herbicide it kills off the friendly colonies of bacteria living in our GI tract called the microbiome.
A unique aspect of glyphosate’s insidious cumulative toxicity is its ability to get inserted into proteins by mistake in place of the coding amino acid glycine. Glycine is the smallest amino acid – one of the twenty or so building blocks of proteins according to the DNA code. Glyphosate is a complete glycine molecule, except that it has an extra methylphosphonate unit attached to its nitrogen atom.
Hope this helps.
Take care and please keep us posted.
V/R, Batch