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An effective broad-spectrum sun blocking agent should be used and unnecessary solar exposure avoided

I can see some lines about long bonds 35-89 but there are no bonds also why no bond between 15-89

And low vitamin B12 is a factor in high homocysteine, an amino acid linked to an increased risk for cardiovascular disease like stroke

1) and exhibits a multitude of biological functions

Endogenous Sources of ROS The mitochondria and NADPH oxidases are among the primary intracellular sources of ROS [60]

Another meta-analysis study made in the USA showed that using vitamin B12 along with folate could produce 1-3 folds more potent effect on lowering tHcy levels than using folate alone [79]