Whether you suffer from : Cancer - Hypertension - Heart rhythm disorders - Autism - Obesity - Rheumatoid arthritis - Type 1 or 2 diabetes - Multiple sclerosis - Crohn's disease - Cold or flu - Inflammatory bowel disease - Tuberculosis - Sepsis - Early onset dementia or other age-related nerve degeneration - Eczema and Psoriasis - Insomnia - Loss of hearing or hearing acuity - Muscle pain - Caries - Periodontosis or Gingivitis - Osteoporosis - Macular degeneration - Pre-eclampsia - Infertility - Asthma - Cystitis - Migraines - Depression - Alzheimer's disorder - Schizophrenia - General Vitamin D deficiency, you definitely need to boost your vitamin D levels.
If you don't have any serious health problems, scientists recommend 40 ng/ml, which is about 5 to 6000 IU of vitamin D3 per day from all sources (sun exposure - food and supplementation). Research suggests a minimum level of 50 to 70 ng/ml/day for optimal health. If you have cancer or severe heart or inflammatory disease, you need even higher dosages.
In any case, the ideal is to take a blood test twice a year to evaluate your vitamin D level, which will allow you to maintain an optimal level throughout the year, winter and summer.
Keep in mind that if you take a vitamin D supplement, you are also increasing your body's need for vitamin K2. Insufficient vitamin K2 helps produce the symptoms associated with "vitamin D toxicity," including poor calcium deposits that can lead to hardening of your arteries.