These beneficial gummies can be taken alone or in combination with Solgar U-Cubes™ Multivitamin Gummies. Each serving of tapioca-based U-Cubes™ Calcium with D3 provides the pediatrician-recommended dosage of Vitamin D3¹…600 IU (per 4 gummies) offers 150% DV of Vitamin D3 for children 4 years and up…and 75% DV (300 IU, per 2 gummies) for children 2 and 3 years of age. Vitamin D3 assists in the absorption of calcium to promote healthy bones and teeth. It also supports immune-system health.