As long as you meet the basic requirements — you’re in good health, 16 or older and weigh at least 110 pounds — you are eligible to donate blood if you used non-synthetic marijuana. Marijuana is a plant that can be used naturally for medicinal and recreational purposes. But synthetic marijuana is a man-made version of the plant that could make you ineligible to donate blood, according to the U.S. Food and Drug Administration. The FDA warns that the blood establishment’s responsible physician should decide how to address a donor who presents with a history of synthetic cannabinoid use.

The Red Cross only accepts blood from individuals who are healthy at the time of their donation. Individuals who have been exposed after caring for someone who has coronavirus or someone who has recently recovered from the virus must wait 28 days after being symptom-free to donate blood. All donors will also have their temperature checked and undergo a mini-physical to ensure they’re healthy on the day of their donation.

Each donor is screened for transmissible diseases by questionnaire at the time of their donation. Each unit of blood is also screened for various infectious diseases, according to the Centers for Disease Control and Prevention. Currently, blood is not being screened for the novel coronavirus.

The Red Cross requires donors to properly wear a mask. If you don’t own a mask and still want to donate, one will be provided to you. If you have a medical condition that prevents you from wearing a mask, the Red Cross is asking that you postpone your donation appointment.

You are typically eligible to donate blood if you’re taking medication. Your eligibility to donate will be based on the reason that the medication was prescribed to you. If your condition is under control and you’re healthy, you’re likely able to donate. But some drugs, like Accutane, Aspirin and Propecia, have a waiting period before blood donation is permitted. Check the Red Cross’ website for a full list of medications that have waiting periods for blood donation.

While many countries have instituted travel restrictions to mitigate risks of the coronavirus spreading, you aren’t necessarily ineligible to donate blood if you’ve recently traveled. According to the FDA, some donor establishments will defer donors who have traveled due to the coronavirus. For example, Vitalant will not accept donations from anyone who has traveled outside of the U.S. in the last four weeks. People who have recently traveled should come prepared with their travel details at the time of their donation. And if you have more questions, check out a complete guide on traveling during coronavirus.

The Red Cross has made it possible for people to donate even in areas that have shelter-in-place declarations. If you’re looking for more ways to give back to your community than just by donating blood, here’s how to send free meals to frontline coronavirus workers as well as other acts of kindness you can do from home.

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