with different types of foam systems for structural firefighting and some have deployed front-line. apparatus with class A foam systems as an added tool in their firefighting arsenals. TYPES OF FOAM DELIVERY SYSTEMS. Class A foams consist of a mixture of water, foam concentrate, and air.
Skin Reaction from Vitamin D. I took a natural vitamin D3 supplement for several weeks and had a skin reaction on my back that slowly went away after I stopped taking it. There were no other variables that could have interfered at that time.
Vitamins are grouped into two broad categories: water soluble vitamins (thiamine, niacin, riboflavin, pantothenate, vitamin B12, folic acid, ascorbic acid) and fat soluble vitamins (vitamin E (tocopherols), vitamin D, vitamin A, vitamin K).itamin Toxicity. Vitamin. Overdose Level. Symptoms. vitamin A. 100,000 units/day. irritability, fatigue, insomnia, painful bones and joints, abnormal bone growth, loss of hair, itchy skin, anorexia, decreased blood clotting time, birth defects, abortions.