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But certain triggers and health conditions may make PVCs more likely These include: High caffeine use High anxiety levels Too little sleep High levels of stress hormones Abnormal blood levels of magnesium, potassium, or calcium Smoking Alcohol use Recreational drug use Side effects from medications, including decongestants and antihistamines Cardiomyopathy Heart valve problems Heart attack Anemia Overactive thyroid (hyperthyroidism) High blood pressure Your risk for PVCs also may be higher than usual if you are: Tall Male Older Not very active Part of a family with a history of PVCs or sudden heart death Premature Ventricular Contraction Diagnosis Even if you've never had symptoms, you may be diagnosed with PVCs during a routine heart test called an electrocardiogram (ECG)

Most of serum copper are bound to ceruloplasmin (CP) while the remaining are bound to albumins and free amino acids

doi: 10.1186/s13578-025-01378-x, 50 HuD.WeinerH

Some older human studies explored DSIP in people with sleep issues and suggested possible effects on sleep structure or daytime function