Nevertheless, it was suggested that taking the vitamin on a long-term basis could help prevent a relapse into depression ( Currently, there is a lack of quality research in this area
For most people, expect about one to two weeks of noticeable effects, with the exact timing shaped by your levels, metabolism, diet, absorption, and age
Oral Supplements: A Quick Comparison For people with a confirmed deficiency, especially those with absorption problems, injections generally act faster than oral supplements: Injections: bypass the gut, reliably reach the bloodstream, and often produce noticeable changes in energy and mental clarity within days for those who are deficient
However, neurological symptoms typically lag behind haematological improvement
Which can be harmful
Some may experience mild redness or soreness at the injection site