As the sheets form from the precursor species, the simultaneous presence of globular particles and fully developed, large sheet-like structures shows a stabilizing effect of the tartaric acid molecules on The titration experiments demonstrated that citric and tartaric acid inhibit the nucleation and crystal growth of Portlandite and C-S-H. Succinic acid does not influence the nucleation of C-S-H but minimally affects the nucleation of portlandite. Despite the close structural similarity between succinic acid and the other two molecules, it neither inhibits dissolution nor nucleation. The role of the calcium complexation of the molecules was quantified using thermodynamic modeling. We could show that the additives stabilize the prenucleation cluster for Portlandite crystallization but do not stabilize the C-S-H prenucleation clusters. Our study also confirmed the limitations of thermodynamic modeling in the context of kinetically controlled precipitation reactions. The stability constants for C-S-H needed to be slightly adapted to obtain good fits for the C-S-H nucleation. This is ascribed to the kinetically formed phases that do not correspond precisely to the C-S-H phases formed at equilibrium conditions.