As mentioned earlier on in the blog, vitamin D helps us absorb calcium into our bloodstream. Ok – we’re going to get technical here – so stay with us!  After this calcium absorption occurs with the help of vitamin D, that calcium then needs to get transported to our bones.  Enter vitamin K2. To get the calcium from our bloodstream absorbed into our bones, we need the help of vitamin K2 (19). Vitamin K2 acts like a postal service (think FedEx) to carry the calcium from our bloodstream and deliver it to our bones.  The reason we bring this up is because long-term supplementation of vitamin D could cause a build-up of calcium in the bloodstream if there isn’t enough vitamin K2 to transport it to our bones (20). But the good news is, most people aren’t deficient in vitamin K2 (19). If you’re eating a well-balanced diet that contains animal products, you’ll be able to get vitamin K2 from dairy products, liver, beef, pork, egg yolks, chicken, and fatty fish like salmon.  If you’re concerned that your baby is getting too much vitamin D and not enough vitamin K2, talk to your doctor. You can ask for a blood panel to be done to check your baby’s vitamin D and vitamin K2 levels.  In addition to offering a vitamin D supplement to your baby and toddler, we would also recommend in certain cases, like if your baby is vegan or vegetarian, to offer a vitamin K2 supplement.  Always talk to your doctor before introducing a supplement to your baby.