Leg cramps happen when calcium floods into your calf muscle cells and causes involuntary contractions—right there, locally, in that specific muscle. But when you swallow pills or drink electrolyte beverages, you're treating your entire body. Even if enough magnesium survives digestion, it gets distributed everywhere—your arms, back, organs, the leg that isn't even cramping. Your suffering calf gets a tiny fraction, nowhere near enough to block those calcium channels and prevent the contraction. That's why 68% of treatments fail and you're still waking up every night. If you don't target the actual muscle where cramping happens, you'll keep losing sleep until chronic exhaustion catches up with you. Topical magnesium delivers 100% of the dose directly to your calves where it concentrates in the muscle tissue, blocks calcium channels locally, and prevents cramping at the source so you can finally sleep through the night.