Designs for Health Vitamin D Synergy with Vitamin K1
Brand: Designs for Health · Form: CAPSULE [E0159] On Market
Our assessment
The evidence shows that Designs for Health Vitamin D Synergy with Vitamin K1 is a combination product, but our data focuses on its key mineral component, calcium. For calcium specifically, the data confirms its critical role in bone health, but also highlights significant safety considerations you need to be aware of [NIH ODS].
How it works
Think of calcium as a structural builder and messenger. It supports bone density through bone mineralization and helps your muscles relax and nerves signal properly [NIH ODS]. This makes it essential for your skeletal strength and overall neuromuscular function.
Safety profile
FDA received 592,059 total adverse event reports for products in this category. The data shows that high calcium intake may increase the risk of heart disease and prostate cancer, and can cause side effects including poor muscle tone, poor kidney function, low phosphate levels, constipation, nausea, weight loss, extreme tiredness, frequent need to urinate, and abnormal heart rhythms [FDA data] [NIH ODS]. Calcium can also reduce the absorption of several medications, including bisphosphonates, tetracycline antibiotics, fluoroquinolone antibiotics, levothyroxine, and phenytoin [NIH ODS].
Our recommendation
Data not available for the specific vitamin D and K1 synergy of this product. For calcium, start by assessing your dietary intake before supplementing. If you take calcium, be cautious with high doses and always separate it from the listed medications by at least 2 hours. Consult your healthcare provider to check if this combination is right for you [NIH ODS].
AI-assisted analysis. Data sourced from NIH DSLD.
Supplement Facts
| Brand | Designs for Health |
|---|---|
| Serving Size | |
| Contents | 240.0 Vegetarian Capsule(s) |
| Market Status | On Market |
How to Read This Label
Supplement labels contain several key sections regulated by the FDA:
- Serving Size — The recommended amount per dose. Always check this — some products require multiple capsules per serving.
- Amount Per Serving — Shows the quantity of each nutrient in the product, typically in IU (International Units), mg (milligrams), or mcg (micrograms).
- % Daily Value (%DV) — Indicates how much a nutrient in a serving contributes to a daily diet. 5% DV or less is low; 20% DV or more is high.
- Other Ingredients — Lists inactive ingredients like fillers, binders, and capsule materials (e.g., gelatin, cellulose, magnesium stearate).
- Suggested Use — The manufacturer's recommended directions for taking the supplement, including timing and dosage.
Source: FDA Dietary Supplement Labeling Guide