When talking about a date in the future...

Use by if a single event will happen before that point:

I will send you the information by Friday. (= before Friday)

Use until if a continuous event will continue and then stop at that point:

ur guests will arrive by 6:00. (= before 6:00)

I'll be working on the project until Friday. or ( continuously until Friday; I will stop working on Friday)

Our guests will stay until 9:00. or ( continuously until 9:00; they will leave at 9:00)

Benefits of Garlic

source of the mineral selenium

Garlic also is a source of the mineral selenium, which is said to fight cancer. Selenium works with vitamin E to boost antioxidant power and prevent or slow the signs of aging - See more at: http://www.cosmeticsandtoiletries.com/formulating/function/antimicrobial/41568362.html#sthash.6k8FbOx2.dpuf