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In the body, they act as signaling molecules, helping regulate hormones, appetite, metabolism, muscle growth and fat storage

J., Yaggie, R., Schaeffer, A

The possible explanations for such conflicting results may be multiple

Insulin-like growth factor I accelerates functional recovery from Achilles tendon injury in a rat model

Common symptoms can include: Extreme fatigue Lethargy Loss of appetite headaches Feeling faint or dizzy Breathlessness Headaches Heart palpitations Tinnitus Additional symptoms of B12 deficiency can include psychological problems such as low mood, irritability, depression, cognitive changes, or blurred memory