If you’re referring to this as a health article/topic, the four warning signs most associated with excessive vitamin D intake are:
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Nausea, vomiting, or loss of appetite — excess vitamin D can raise blood calcium levels, causing gastrointestinal symptoms. ODS+1
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Extreme thirst and frequent urination — high calcium can cause dehydration and increased urine production. ODS
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Muscle weakness, fatigue, or confusion — these can occur when calcium levels become excessively high. ODS+1
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Kidney problems, including kidney stones — severe vitamin D toxicity can damage the kidneys and, in extreme cases, cause kidney failure. ODS+1
How much is too much?
For most adults, the tolerable upper intake level is 4,000 IU (100 mcg) of vitamin D per day from all sources. This is an upper limit, not a target dose, and doctors may temporarily prescribe higher doses to treat documented deficiency with appropriate monitoring. ODS+1
Vitamin D toxicity is generally caused by excessive supplementation, not ordinary sun exposure. ODS
If you’re taking a high-dose vitamin D supplement and have several of these symptoms, it’s sensible to contact a healthcare professional rather than continuing to increase the dose.
