Somatropin shots are significantly riskier than HGH pills. These products are made up entirely of natural ingredients including amino acids, vitamins, and minerals, and their formulae rarely cause any negative side effects. You don't need a doctor's prescription to take these vitamins. Somatropin shots, on the other hand, have a far stronger influence on HGH levels, leaving opportunity for significant negative effects. Taking somatropin injections can cause a variety of adverse effects, including: Itching or pain at the injection site. Pain in the muscles or joints. Gaining weight quickly. Swelling \\sNumbness. stomach ache. Symptoms of a cold or flu. Headache. Back ache. Many of these adverse effects are uncommon, and other people do not have any at all while using somatropin. Your doctor can assist you in determining which HGH treatment is best for you and weighing the benefits and drawbacks of each for your individual health needs.