Running also increases the expression of Egr1/NGFI-A/Zif268/Krox-24 , an immediate early gene (Tong et al., 2001)
Oral supplements, on the other hand, are taken as tablets or liquids and must pass through the stomach and intestines, where absorption can be slower and weaker, especially for patients with digestive problems
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Unlike oral supplements, which may lose potency as they pass through the digestive tract, vitamin injections provide a direct, targeted dose that your body can use right away
A vial labeled "5 mg" may actually contain 4.85 mg or 5.1 mg depending on fill variation during manufacturing