The solubility of this product has not been determined. A similar product, A8556, is soluble at 20 mg/mL in water. The solubility of the 40817 is expected to be similar. Please see the links below to review the PubChem information for each item.
40817, 6?-Sialyl-D-lactose, Na salt
https://pubchem.ncbi.nlm.nih.gov/substance/57650019
A8556, 6?-Sialyllactose sodium salt
https://pubchem.ncbi.nlm.nih.gov/compound/132285181