I take 400mg elemental magnesium per day, and if I don't, I get muscle twitching

I take enough Magnesium Glycinate to equal 400mg of elemental magnesium per day. Have been taking this much for years.

If I accidentally miss a dose, I get muscle twitches within 6 hours of that missed dose. I do take Vitamin D 4000 IU daily, and Vitamin K2 100 mcg daily.

I'm a woman who is slightly underweight. Is it safe for me to increase the dosage of magnesium, would that help? It seems like my body is signaling to me that it's not getting enough.

I've tried adding topical magnesium spray or lotion to the mix but I can't stand it from a sensory standpoint.

Thanks.