For a non-dietary cause, maintenance is usually one injection every two to three months for life
They help not just fix deficiencies but also boost overall health and energy
More serious deficiencies have the potential to impair heart and neurological function, leading to a wide range of serious symptoms, including but not limited to tinnitus, severe joint pain, memory problems, depression, anxiety, poor muscle function, ataxia and changes in reflexes
In support of the idea that cross-protective immunity exists, recent HCoV infections were found to be associated with less severe COVID-19 upon infection with ancestral SARS-CoV-2 [103], and infection with SARS-CoV-2 of any variant was also associated with a reduced incidence of subsequent HCoV infection