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.
1 When vitamin B12 is taken at normal doses, side-effects are rare. 2  High doses may cause acne. 3  Allergies to vitamin B12 supplements have been reported and can cause swelling, itchy skin and shock.4  Interactions. 5  Drugs for acid reflux, diabetes and other conditions may make it harder for your body to absorb vitamin B12. When vitamin B12 is taken at normal doses, side-effects are rare. 2  High doses may cause acne. 3  Allergies to vitamin B12 supplements have been reported and can cause swelling, itchy skin and shock.