Seema Sarin of EHE Health explains that the Recommended Dietary Allowance (RDA) of Vitamin D for children 1-18 through adults through age 70 is 600 International Units, or 15 micrograms (mcg), daily. After age 71, 800 International Units, or 20 mcg, are needed. Hence, nutritionist and yoga instructor, Keri Gans suggests trying to sit by an open window for a little while. “Besides getting some vitamin D it may also help boost your mood a little,” she points out.

Sure, there are lots of Vitamin D supplements out there. But considering you may be cooped up at home for a while and likely not eating as much fresh produce as usual, you should consider taking a high-quality multi-vitamin. Many are fans of 'Ritual', a one-per-day capsule formulated as a beneficial supplement for women by age, that simplifies the vitamin-taking process and is even essenced with mint to make the act of gulping down your pill a little more palatable.

If you can’t get natural light, artificial is the next best thing. “For those who can’t get outside, and especially those inside apartments that may not get much natural light, a therapy lamp is a great way to increase your light exposure,” quips Sara Skirboll, Shopping & Trends Expert at 'RetailMeNot'. In many cases, these therapy lamps can help improve mood and regulate your circadian rhythm during such critical times.

Mushrooms are the only source of vitamin D in the produce section. For the most Vitamin D action, experts suggest choosing those mushrooms that have been exposed to UV light by the growers. Or, for a fun and healthy indoor activity, you can even grow your own maitakes (also known as hen of the woods mushrooms). If you really want an extra dose, make a mushroom omelet, to add additional Vitamin D as egg yolks are touted as great Vitamin D sources too.