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The symptoms of vitamin B12 deficiency can be quite debilitating and include, according to scientific research: Chronic fatigue and weakness Shortness of breath Heart palpitations Tingling or numbness in the extremities Poor balance Loss of concentration and poor memory Disorientation Mood changes, including depression Insomnia Imagine trying to maintain a healthy, active lifestyle when you're constantly battling severe fatigue and low energy

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IGF-1 LR3 may also be able to regulate the metabolism of various compounds and thus ensure that tissues receive a greater amount of nutrients, using them better

Additionally, FDA should create a green list of authorized FDA-registered manufacturers of these substances, Brunner said