Vitamin K

K1 is phylloquinone, K2 is a group of menaquinones, and MK-7 is one form of K2. These are not three names for the same substance. BJP Vitamin D3 + K2 + K1 contains 37.5 µg of K2 and 37.5 µg of K1 per capsule, so this is not 75 µg of K2 alone. Compare each row separately, rather than just the total vitamin K figure.

Decide whether you also want to supplement vitamin D. Viridian Vitamin K2 100 µg contains K2 on its own, whereas Viridian Vitamin D3 & K2 adds 25 µg of D3 to 45 µg of K2 per capsule. If you already take vitamin D, the blend adds more. Check the amount you need; do not choose a blend just because its name is longer.

Not always. Woldo Vitamin K2 MK7 lists 200 µg for a whole serving of 10 drops, which is 20 µg per drop. A full pipette is not the same as a drop. Before comparing it with capsules, check how many drops the figure refers to and use the dropper supplied with that particular product.

Buying vitamin D is not itself a reason to add another product. There is no single universal ratio for every situation. Check your intake of both vitamins from food and supplements; K2 does not remove the risks of excessive vitamin D intake. If a doctor has recommended vitamin D, discuss adding a combination with them.

Vitamin K intake can affect warfarin's action. Do not start, stop or change a separate supplement or a blend containing K without consulting the doctor managing your treatment. A consistent intake matters, rather than cutting out vegetables entirely. Have the product name and vitamin amount per serving ready so they can assess the specific change.