On a summers day it will start to kill weeds within 2-3 hours, with visible signs in within 4-5 days it takes 6 or more hours in the winter. If it rains it will be much less effective. Roundup fumes are not toxic, it's a herbicide not a pesticide so try not to drench yourself in it or drink it.
The best time to take Magnesium-OK is after a meal, once a day with a liquid, every day, according to Wassen, the product manufacturer. The nutritional supplement tablets, specially formulated for women, contain eight vitamins and six minerals to maintain general vitality and health throughout the monthly cycle.
1 To increase your magnesium, eat whole grains, vegetables such as summer squash, green beans, broccoli, cucumbers, and spinach, and nuts and seeds.  Adult women under 30 need 310 milligrams a day, while women over 30 need 320 milligrams. Men need 400 milligrams before 30 and 420 milligrams after 30.