Rest assured that your experience is not unusual.
Different people can have very different experiences with B vitamins, and different people here may have very different answers to your question.
Here are some basic tips that have personally helped me tolerate the start-up effects of B vitamins:
- As a general rule "start low and go slow", which means start with a low dose and very slowly increase the dose until the start-up effects go away.
- Before tackling folate or B12 supplements, first try taking a simple B vitamin supplement without any folate or B12, such as the B multivitamin called "B minus" from the company Seeking Health. This multivitamin includes all the B vitamins in relatively reasonable quantities, but without any folate or B12, allowing you to separately decide upon your own folate or B12 dosages. https://www.seekinghealth.com/products/b-minus-100-capsules
- Once you can tolerate the B vitamin supplement well, try adding 400mcg methyl-folate. Start with one dose, wait a couple days until the effects wear off, and then try the second dose. If you experience unusual muscle cramps, try taking low doses of potassium as many people find that a bit of potassium helps to lessen the start-up effects.
- Once you can tolerate 400mcg methyl-folate daily, try adding very small doses of hydroxy-B12. Again- start low and go slow. Different people can have very different reactions to B12. If you experience unusual muscle cramps, try taking low doses of potassium as many people find that a bit of potassium helps to lessen the start-up effects.
Hope this helps.