Myth: Light exposure breaks down vitamin C. Stable vitamin C formulas, especially those in dark and airtight packaging, are built to withstand brief light exposure
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Always good to have a reason I have also had this happen when my folate was low , it may be worth you getting it checked I had self inject my B12 every 4 weeks for the last 20+ (cannot really remember how long accurately), and 2 months ago got a similar 'electric shock tingling' all over my body - head, face, arms, hands, legs, feet etc within a couple of minutes of injecting, which lasted about 3 seconds or so
( L-CARNITINE ) ( ) Galloway SD, Craig TP, Cleland SJEffects of oral L-carnitine supplementation on insulin sensitivity indices in response to glucose feeding in lean and overweight/obese malesAmino Acids.(2011 Jul) 10 The role of carnitine in the male reproductive system 250mg~2000mg