The loss of ability to absorb vitamin B 12 (B 12) is the most common cause of adult B 12 deficiency. Impaired absorption of vitamin B 12 may be due to a loss of intrinsic factor or to a number of other conditions that decrease production of gastric acid, which also plays a part in the absorption of B 12 from foods.
One of the best natural insect repellent is Lemon Balm. If you insist to go for organic route, Lemon Balm which contains high Citronellal contents is able to repel insects such as mosquitoes, flies, ants and etc. However, Lemon Balm does not deter butterflies or bees.
1 Lemon Eucalyptus oil can be used to repel mosquitoes. 2  Rubbing the skin with baby oil or imitation vanilla extract repels biting insects such as mosquitoes and blackflies.  One of our favorite remedies is rubbing apple cider vinegar on your skin to repel insects.