Operation Vitamin B

'Vitamin B' was a German unrealised plan by the headquarters of General Ernst-Eberhard Hell’s VII Corps of Generaloberst Hermann Hoth’s 4th Panzerarmee, part of Generalfeldmarschall Erich von Manstein’s Heeresgruppe 'Süd', for an initial follow-on attack for the southern element of 'Zitadelle' (5 July 1943).

Intended as the exploitation of the 4th Panzerarmee's expected initial success, the undertaking was to be launched two days later as the means of securing a breakthrough between Sumy and Snagost with the object of destroying the forces of General Nikolai F. Vatutin’s Voronezh Front concentrated in the area around Sudzha.