Which magnesium is best absorbed?
Bisglycinate and citrate, comfortably ahead of oxide. The form is on the pack, and it is worth checking before comparing prices - two products can look identical and behave quite differently.
Why does magnesium spray tingle?
It is a common reaction to the concentration on the skin, particularly the first few times. It usually settles as you keep using it. Applying to damp skin or after a shower reduces it.
When should I take it?
Whenever you will remember. Some people prefer the evening, and taking it with food suits most. Consistency matters more than timing.
Can I take too much magnesium?
Very high oral doses have a laxative effect, which is your signal to cut back. Stick to the pack, and count what is already in a multivitamin.