DK Fuel™ is a pleasant tasting, naturally emulsified liquid vitamin D3 with vitamin K1 and K2. DK Fuel™ is a concentrated, highly bioavailable liquid vitamin D formulation offering 2,000 IU per 1 ml (one full dropper) with 250 mcg of vitamin K1 and 25 mcg of vitamin K2. This is a convenient, pleasant tasting and easily mixed formula.
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In the winter I feel so sluggish and sometimes depressed. I didn't realize it was as simple as not getting enough sun. During the winter months I take these every day. When I first started, I noticed a difference within a week. I felt much more energetic and motivated. I was out in the cold garage working on my cars again instead of sitting around the house watching TV. Caffeine will only make you crash and feel more tired. If your body needs Vitamin D, you won't feel better until it has some.