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Can You Take Calcium and Galactooligosaccharides (GOS) Together?
May affect absorption
The short answer
Galactooligosaccharides (GOS) are soluble fibers that may transiently bind calcium in the upper GI tract, though fermentation in the colon may partially offset this by enhancing colonic calcium absorption.
How to arrange timing
Separate galactooligosaccharides and calcium supplements by at least 2 hours to ensure optimal upper GI calcium absorption.
Reference
Reference noted for this combination: NIH ODS; NatMed Pro Fiber Monograph; Scholz-Ahrens KE et al., J Nutr 2007
Important context
Whether supplements suit you together also depends on dose, product formulation, health conditions, and medication use. Ask a doctor or pharmacist first if you take medication, are pregnant or breastfeeding, or have a chronic condition.