What does a vitamin D level of 80 mean? Are there any symptoms associated with this vitamin D level?

A vitamin D level of 80 ng/mL is considered elevated. Elevated vitamin D can occur from over-supplementation of vitamin D, excessive exposure to sunlight or artificial UV light (tanning beds), and overconsumption of high vitamin D foods such as cod liver oil [1].

A level of 80 ng/mL is the lowest reported level associated with toxicity in people with normal kidney function [2]. A level at or above 80 ng/mL may put you at greater risk for developing vitamin D toxicity over time, though adverse effects are typically only observed at levels >125 ng/mL [1]. 

Vitamin D toxicity is usually caused by large doses of vitamin D supplements — not by diet or natural sun exposure [1]. Symptoms of toxicity include fatigue, weight loss, loss of appetite, excessive thirst and urination, constipation, dehydration, nausea/vomiting, muscle weakness, ringing in the ear, confusion, and heart arrhythmias.

Factors that could contribute to a vitamin D level of 80

• Over-supplementation of vitamin D

• Frequent, prolonged sun exposure (i.e. multiple hours per day most days)

• Frequent tanning bed use

• Overconsumption of high vitamin D foods such as cod liver oil

While excessive sun exposure can result in elevated vitamin D levels, it is not thought to cause toxicity because thermal activation of pre-vitamin D3 in the skin gives rise to various non-vitamin D forms that limit the formation of vitamin D3 [1]. Some vitamin D3 is also converted to inactive forms. Unlike the sun, frequent use of tanning beds, which provide artificial UV radiation, can lead to toxicity (levels >125 ng/mL).

What to do if your vitamin D level is 80?

To reduce vitamin D levels:

• If supplementing, reduce the amount and/or frequency of vitamin D you are taking, or stop supplementing altogether until levels return to the optimal range.

• Stop buying and consuming foods fortified with vitamin D as these will contribute to your overall supplementation levels. 

• Stop use of tanning beds

• Avoid excessive sun exposure by spending less time in the sun and wearing sunscreen and protective clothing.