A week ago I started taking a medicine that is in Spain called CN Base and has many components of vitamins and minerals. A few days later I noticed an improvement in the post-exertion fatigue (it was more tolerable) and I notice that the pulsations go up less than before. I have not tried to walk more than I can usually do, because I do not want to force my body either. But of course, the fatigue has been less. After waiting a few days to confirm it, I think it is some component of the medicine and I deduce that it is magnesium. I do not know if I have a deficit or not, in the test of metals and minerals in the hair follicle of the hair it came out in addition to high several metals, low in magnesium and potassium. Potassium in blood is always in range, but magnesium has never looked at it in blood. I have read in some places that magnesium can relieve the symptoms of POTS in some people, I imagine that because they have a deficit (the deficit gives dysautonomic symptoms apparently). What worries me, to put it somehow, is that the CN Base drug only brings 40mg. per capsule and sometimes at rest with the heart rate monitor of 60 beats per minute and occasionally I have reached 47. I had thought about taking more magnesium separately but it seems that if there is excess it can cause serious symptoms such as sudden hypotension that can leave you unconscious. One capsule CN Base contains: Retinol acetate (vit A) 340 μg retinol Colecalciferol (vit D3) 7.5 μg Succinate of D-alpha-tocopheryl (vit E) 10 mg of alpha-tocopherol Calcium ascorbate (vit C) 150 mg of vitamin C Thiamine hydrochloride (vit B1) 4.2 mg. Riboflavin-5-phosphate (vit B2) 4.8 mg. Niacinamide or Nicotinamide (vit B3) 7 mg. Calcium D-pantothenate (Vit B5) 4 mg Pyridoxal 5-phosphate (vit B6) 6 mg Biotin (vit B7) 75 μg Calcium L-Methylfolate (vit B9) 150 μg of folate Methylcobalamin (vit B12) 3 μg Calcium citrate 25 mg calcium Total calcium 37 mg Magnesium citrate 37.5 mg of magnesium Zinc citrate 5 mg zinc Copper citrate 0.50 mg copper Manganese Citrate 0.80 mg manganese Sodium molybdate 15 μg molybdenum Sodium selenite 50 μg selenium Chromium picolinate 65 μg chrome R-lipoic acid 50 mg Coenzyme Q10 fermented 50 mg Natural additives: silicon dioxide and microcrystalline cellulose.