Weight gain is not a known or direct side effect of 2B12 tablets. However, in rare cases, some individuals may experience slight weight changes indirectly due to improved appetite, enhanced energy levels, or better overall metabolic function following correction of vitamin deficiencies. These effects are not typical and are not experienced by most users. If you observe significant or unexpected weight changes while taking 2B12. In such cases, it is advisable to consult a healthcare professional for personalised guidance.