Nick, Kat,
As it appears you're both in the same boat with klingon CH still hitting, but at longer intervals and less intense pain, the same answers may apply.
First, it's always wise to see your PCP/GP for lab tests of your serum 25(OH)D3, calcium and PTH. On one hand, without the results of these labs in hand, you're shooting in the dark on whether or not to take additional loading doses of vitamin D3. On the other hand, if you're still experiencing CH, the most common cause is your serum 25(OH)D3 is still too low.
On that point you need to understand that the mechanism of action by which vitamin D3 and its cofactors help prevent CH involves genetic expression that takes place at the cellular level in the DNA contained in the trigeminal ganglia neuronal nucleus. Accordingly, the serum level concentration of 25(OH)D3 is just a biomarker.
That said, the law of molecular diffusion across a semipermeable cellular membrane and into the cell cytoplasm would dictate the cellular concentration would be at least as high as the serum concentration and likely higher. Accordingly, it's best to think of the 25(OH)D3 serum concentration as the reservoir and as long as the serum concentration in that reservoir is high enough, there should be sufficient cellular concentration of vitamin D3 and 25(OH)D3 to enable the needed genetic expression.
Bottom line, many CHers on the verge of going completely CH pain free have found an additional 3 to 5 days of 50,000 IU/day vitamin D3 loading doses does the trick. Then drop back to an initial vitamin D3 maintenance of 50,000 IU/week with the Bio-Tech D3-50. If the CH return at that maintenance dose, load for another couple days then increase the maintenance dose to one (1) Bio-Tech D3-50 every 5 days. A few CHers have needed to dose with the Bio-Tech D3-50 at one every 3 days during the high pollen or mold spore seasons.
Doubling the magnesium dose to 800 mg/day (400 mg in the am and 400 mg in the pm) while loading vitamin D3 is very important as the enzymatic processes that hydroxylate vitamin D3 to 25(OH)D3 and 25(OH)D3 to 1,25(OH)2D3 consume magnesium. Without the additional magnesium you can end up with a calcium-magnesium imbalance caused by too little magnesium. Muscle cramps are a classic indication of insufficient magnesium.
In a preliminary analysis, a GrassrootsHealth Nutrient Research Institute study found that individuals who do not take supplemental magnesium need, on average, 146% more vitamin D to achieve a blood level of 40 ng/ml (100 nmol/L), compared to those who take at least 400 mg of magnesium per day.
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In some cases, doubling the Omega-3 fish oil has helped achieve a CH pain free response. The switch to Methyl Folate+ vitamin B complex is also a good move. Since switching to Methyl Folate + in Jan of 2019, I've not had any CH burn through hits due to allergic reactions and the pollen has been fearsome around here.
Regarding the Benadryl (Diphenhydramine HCL) if there's no response with a marked decrease in the frequency of CH after 5 days, I would discontinue.
Hope this helps. Take care and please keep us posted.
V/R, Batch