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However, someone with a more severe, long-standing deficiency might need to wait a little longer, possibly requiring multiple injections over several weeks or months to fully replenish their B12 stores and reverse symptoms

Ruenzi et al., 2005) and in experimental rat studies (see Seiwerth et al., 2018), a point recently confirmed (Xu et al., 2020)

Some men exhibit diminished testicular volume or modified sperm formation when treatment is misused

Additionally, some vitamins may last longer than others

Testosterone levels tend to rise quickly after an injection and then gradually decline, leading to wider peaks and deeper drops

13a, b), refuting the hypothesis that Wnt activity in the DP suppresses the expression of Dkk2 and Notum