Black discolouration of the tongue or genital area is not a known side effect of Neurobion Forte Tablet. The supplement is generally well tolerated, and side effects at the recommended dose are rare and usually mild, such as minor stomach upset. It is advisable to stop the supplement temporarily and consult your doctor for a proper evaluation to rule out any underlying conditions and to determine whether it is safe for you to continue.

Neurobion Forte Tablet is a vitamin B complex supplement that is generally safe for daily use in adults. However, the correct dosage depends on your individual health needs and any existing medical conditions. It is advisable to consult a doctor before starting daily supplementation to ensure it is appropriate for you.