Some vitamins can cause problems if taken in excess - a classic being B6 (the precise vitamer also matters). Whereas it almost doesn't matter how much B12 you take.
And don't assume that everything that is water soluble just ends up in your urine. It really isn't that simple.
My view is that you should only take what you really do need so as to restore, then maintain, levels.
The problem being having the slightest idea about so many of them!
Just the other day, I posted something which specifically highlighted that some people (those with coeliac disease) have impaired folic acid absorption. Meaning one person might need no more than 400 micrograms, another could nee 5 milligrams.
Celiac Disease: A Forty-Year Analysis in an Italian Referral Center
When it comes to nutrients of any kind, I try to get my levels up to optimal or as close to optimal as I can. Let's suppose I'm taking X at a high dose 7 days a week. Then I get X to optimal.
Rather than buying a different product I continue taking the supplement I always buy (because I know I can tolerate it) but I take it one day a week. If my level drops I increase to 2 a week, say, one on Monday and one on Thursday.
I keep monitoring and raising my dose until my level stops dropping and stays optimal. Once I'm happy my level is where I want it and it is staying there I reduce the frequency of testing to save money.
I’ll be honest I’ve found the ‘maintaining’ part really challenging. The advice here on the forum has really helped and my GP (unusually) was also helpful testing me for what she labels ‘toxicity’ through supplementation. It turned out I was still under range for zinc a a smidge over for selenium everything else was peachy. I’ve switched Thorne B Complex to a weaker formulation but supplement extra B12 oral and injections as I get tingling and numbness without. Balancing ferritin is my most challenging as perimenopausal with huge but now infrequent menstruation. I take a few a week normally and every day during a bleed and for a few days after. Hope that helps 🌱
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