Most People Taking Vitamin D3 Are Missing the Second Half of the Equation
D3 increases calcium absorption. K2 tells that calcium where to go — bones and teeth, not arteries. Taking D3 without K2 is like getting the raw material without the routing system. Sports Research puts both in one softgel, dissolved in organic olive oil for absorption, at 5,000 IU D3 and 100mcg MK7 K2. Over 60,000 Amazon buyers have purchased this combination. Here is what the review volume actually tells you, and who this supplement is right for. Always consult a healthcare provider before starting any supplement regimen.
Sports Research Vitamin D3 + K2 (MK7) — 5000 IU / 100mcg
Is This Page For You?
- ✓You already take Vitamin D3 and your doctor or research led you to D3K2 — this is the combination most commonly cited in the research and by functional medicine practitioners.
- ✓You're in a climate with limited sunlight for most of the year — northern latitudes from October through April produce almost no UV-B, which means the body can't synthesize D3 from sun exposure. Supplementation is the practical answer.
- ✓You want the combination in one softgel rather than managing two separate supplements — D3 and K2 are both fat-soluble, and this formulation puts both in organic olive oil for co-absorption.
- ✗You have a diagnosed health condition requiring specific dosing — consult a doctor before any supplement, especially at 5000 IU D3 which is higher than the RDA for most adults.
- ✗You're looking for a lower-dose maintenance supplement — 5000 IU D3 is a supplementation-level dose, not a maintenance dose for those who are not deficient. Lower dose options (1000 IU, 2000 IU) exist if you only want moderate support.
What 60,000+ Reviews Actually Tell You
In the supplement category, review volume at 4.8 stars is a meaningful signal. Supplements tend to generate negative reviews quickly when they cause side effects or don't deliver on their claims — at 60,000+ reviews, the 4.8-star average represents a very large sample of buyers who noticed no adverse effects and continued buying. The repeat-purchase rate for this specific product, visible in the subscription discount adoption, suggests buyers aren't abandoning it after one bottle.
The consistent themes in positive reviews: easy to swallow (softgel, not a hard capsule), no fishy aftertaste (olive oil, not fish oil carrier), and bloodwork showing improved D3 levels in buyers who were deficient. The negative reviews center almost entirely on shipping (damaged bottles) or expecting immediate felt effects — which D3K2 supplementation does not produce in a short timeframe.
| What Buyers Report | Frequency |
|---|---|
| Easy to swallow — softgel, no hard capsule | Mentioned consistently |
| No fishy aftertaste or aftertaste of any kind | Frequently cited as a positive |
| Improved D3 bloodwork levels when previously deficient | Noted by buyers who retested |
| Continued purchase / subscription — repeat buyers common | High subscription rate |
| Shipping damage on bottles occasionally | Main driver of negative reviews |
| No dramatic felt effect (expected — D3 is not stimulant) | A common negative review category |
What Buyers Like
- ✓D3 + K2 in one softgel — no managing separate supplements
- ✓Organic olive oil carrier for absorption without a meal
- ✓MK7 form of K2 — longer half-life than MK4, better for once-daily dosing
- ✓60,000+ reviews at 4.8 stars — unusually strong signal for a supplement
- ✓Non-GMO, gluten-free — clean label with minimal additives
- ✓Subscription option reduces cost per bottle for long-term users
What to Know Before Buying
- ✗5000 IU is a supplementation-level dose — confirm appropriateness with your doctor
- ✗Not a felt supplement — don't expect immediate energy or mood changes
- ✗Shipping damage occasionally reported — check arrival condition
- ✗Consult a healthcare provider before starting any supplement, especially with existing conditions or medications
Supplement Facts
| ASIN | B01JIJHZC8 |
| D3 dose | 5000 IU per softgel |
| K2 form | MK7 (Menaquinone-7) — 100mcg per softgel |
| Carrier | Organic extra virgin olive oil |
| Certifications | Non-GMO verified, gluten-free |
| Serving | 1 softgel daily |
| Amazon rating | 4.8★ · 60,000+ reviews (est.) |
| Brand | Sports Research |
| Disclaimer | These statements have not been evaluated by the FDA. This product is not intended to diagnose, treat, cure, or prevent any disease. Consult your healthcare provider. |
Prices and review counts are estimates and may vary. Always check Amazon for current pricing and verify supplement information with a healthcare provider.
Common Questions
Why does D3 need K2?
D3 increases calcium absorption. K2 directs that calcium into bones and teeth rather than leaving it to accumulate in soft tissue and arteries. The two nutrients are considered complementary — D3 for absorption, K2 for routing.
What's the difference between MK4 and MK7?
MK7 stays active in the body much longer than MK4 — days versus hours. MK7 is effective with once-daily dosing. MK4 requires multiple doses per day to maintain consistent levels. Sports Research uses MK7.
Why is it dissolved in olive oil?
D3 and K2 are both fat-soluble vitamins — they absorb significantly better with dietary fat. The olive oil in each softgel provides the fat required for absorption, eliminating the need to take this with a fatty meal.
These statements have not been evaluated by the FDA. This product is not intended to diagnose, treat, cure, or prevent any disease.
Get our best picks in your inbox
No spam. Just honest Amazon reviews, once a week.
Unsubscribe any time. We'll never sell your address.