Despite previous studies highlighting the benefits of Vitamin D, too much could increase the risk of falls in seniors, per new research in JAMA Internal Medicine.

Swiss investigators found increasing Vitamin D dosage didn’t markedly improve function in 200 seniors, and 60.5% fell during a 12-month treatment. That was compared to 47.9% who fell in the low-dose Vitamin D group.

The authors suggest seniors follow the Institute of Medicine’s recommendations on Vitamin D intake, which say people over 70 should take a total of 800 IU of Vitamin D per day.