What is Vitamin K1 (phytonadione)?

Category: Supplements

Most popular types: Mephyton


Vitamin k 1 or phytonadione is a fat soluble vitamin used to promote proper growth and good health, for vitamin K deficiency, as a supplement for people who cannot digest fat soluble vitamins, and to prevent or treat bleeding.

Reported purpose & perceived effectiveness
Purpose Patients Evaluations Perceived Effectiveness
Increase effect of another treatment 4 1
Cystic fibrosis 1 0
Fat malabsorption 1 0
Support immune health 1 1

  • Major
  • Moderate
  • Slight
  • None
  • Can't tell

Side effects

Side effects as an overall problem

Side effects as an overall problem
Severity Evaluations
Severe 0
Moderate 0
Mild 0
None 1

Commonly reported side effects and conditions associated with Vitamin K1 (phytonadione)

Side effect Patients


Based on patients currently taking Vitamin K1 (phytonadione)

Dosage Patients
120 mcg daily 1
125 mcg daily 1
200 mg daily 1
500 mcg daily 1

Why patients stopped taking Vitamin K1 (phytonadione)

Multiple reasons could be selected

Reason Patients
Other 1
See 1 patient who's stopped taking Vitamin K1 (phytonadione)


Currently taking Vitamin K1 (phytonadione)

Duration Patients
6 months - 1 year 1
2 - 5 years 2
10 years or more 1

Stopped taking Vitamin K1 (phytonadione)

Duration Patients
Less than 1 month 1
Adherence Evaluations
Always 0
Usually 1
Sometimes 0
Never taken as prescribed 0
Burden Evaluations
Very hard to take 0
Somewhat hard to take 0
A little hard to take 0
Not at all hard to take 1
Last updated:
There are no evaluations for Vitamin K1 (phytonadione).