Dolovent™. £ 36.88 — available on subscription. Dolovent™ delivers key ingredients: 600mg of magnesium. 400mg of vitamin B2 (riboflavin) 150mg of coenzyme Q10. An excellent source of key micronutrients Riboflavin, Magnesium and Co-enzyme Q10. Dolovent™ contains 120 capsules. Rated 5.00 out of 5 based on 9 customer ratings..