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You train hard. You recover right. You track your macros (at least on weekdays).
And you pop that daily Vitamin D, because someone on a podcast said it boosts testosterone.
But here’s what almost no one tells you:
If you’re taking D3 without K2 — you’re doing it wrong.
And not just wrong… possibly dangerous in the long run.
Let’s dig in.
🌞 Why Vitamin D Matters (Especially for Lifters)
Vitamin D3 is more than the “sunshine vitamin” — it’s a hormone-like nutrient that plays a massive role in:
- Stimulating testosterone production via luteinizing hormone
- Boosting muscle recovery and strength output
- Supporting the immune system, so you stay consistent in the gym
- Improving calcium absorption, keeping bones dense under heavy loads
🧪 In one study, vitamin D-deficient men who took D3 saw their testosterone levels increase by 25%. Not bad for a daily capsule.
[Pilz et al., Hormone and Metabolic Research, 2011]
But there’s a twist…
⚠️ The Dangerous Side of D3 (When Taken Alone)
Vitamin D3 tells your gut to absorb more calcium.
Good? Yes — if that calcium ends up in your bones.
Bad? If you’re low on vitamin K2, your body might start dumping that calcium into soft tissue… like your arteries.
The result?
Harder arteries, tighter blood vessels, and the kind of long-term issues that’ll put you out of the gym permanently.
🧬 Vitamin K2 (MK-7): The Calcium Traffic Cop
K2’s main job is to direct calcium where it belongs — into your bones and teeth, not your arteries.
It does this by activating two crucial proteins:
- Osteocalcin → binds calcium to bone matrix
- MGP (Matrix Gla-Protein) → keeps calcium out of your arteries
Think of D3 as the gas pedal, and K2 as the steering wheel.
Without K2, you’re just flooring it into a wall.
🧠MK-7 vs MK-4 – Which One’s Better?
You’ll often see two forms of K2:
- MK-4 – Shorter half-life, cheaper
- MK-7 – Longer lasting, more stable, better for once-daily use
For long-term, daily D3 pairings — MK-7 wins.
It stays in your system for 2–3 days, meaning better calcium control and better bone/artery protection.
đź’Š The Stack That Actually Makes Sense
Here’s what a lifter-focused, hormone-supporting, artery-protecting daily stack looks like:
| Nutrient | Dose | Purpose |
|---|---|---|
| Vitamin D3 | 4,000–5,000 IU | Testosterone, muscle, immunity |
| Vitamin K2 | 90–120 mcg (MK-7) | Calcium control, artery + bone health |
âś… Supplement Example I Actually Use
[Bronson Basics Vitamin D3 + K2 (MK-7)]
- 125 mcg D3 (5,000 IU) + 90 mcg K2 (MK-7)
- 360 tablets — One-a-day = One full year
- GMO-free, gluten-free, soy-free
- Straightforward, no BS, no “proprietary blends”
🤯 My Rant on Year Supplies (AKA The Subscription Trap)
Let me go off-script for a second — because yeah, I’ve got a bit of a hard-on for year supplies.
Here’s why:
Supplements are just subscriptions in disguise.
Buy one bottle here, another bottle there, and suddenly your entire supplement stack feels like you’ve accidentally subscribed to 17 different Netflixes — and none of them get you jacked.
Monthly restocks? đź’¸ Headache.
Year supply? âś… Pop it in your drawer, forget about it, stay consistent.
So if you’re wondering why I always recommend long-lasting options — it’s not just to flex affiliate links (though hey, let me be honest — I got mouths to feed too).
It’s because it’s how I supplement.
I look for affordable, long-lasting, clinically dosed stacks — and if a year supply exists, I’ll recommend it. If it doesn’t, I’ll tell you.
đź‘€ What to Expect:
No, you won’t feel superhuman the next day. This isn’t caffeine or creatine.
But give it weeks, even months, and you may notice:
- More consistent recovery
- Fewer immune crashes
- Slight boost in mood and drive (especially in winter)
- And more importantly… a body that holds up as you keep lifting heavy into your 30s, 40s, and beyond
đź“Ś TL;DR Recap (For Skimmers and Google)
- Vitamin D boosts testosterone, immunity, and calcium absorption
- K2 (MK-7) makes sure calcium goes to bones, not arteries
- Together, they support long-term strength, hormonal health, and heart health
- Bronson D3 + K2 is a perfect year-supply, one-pill stack for lifters
- Don’t expect a miracle — expect consistency, longevity, and less guesswork
đź“Ł Final Thoughts (and Call to Action)
If you care about testosterone, strength, or just not being the guy who lifts hard but eats like a pigeon —
D3 + K2 needs to be in your stack.
And if you’re like me — someone who wants simplicity, affordability, and zero re-ordering headaches — grab the year supply. One purchase. One drawer. Done.
👉 [Check out Bronson D3 + K2 (MK-7) on Amazon]
🛒 360 tablets – One a day – One year of gains and artery protection
No fluff. Just function.
