Bone-health supplements, with the calcium-vitamin-D-K2 trio in context, ranked by evidence.

Top 8 supplements, ranked by evidence

Tier	Supplement	Overview
Strong	Calcium	The most abundant mineral in the body, critical for bone health, muscle contraction, nerve signaling, and blood clotting.
Strong	Vitamin D3	The sunshine vitamin, essential for calcium absorption, bone health, immune function, and mood regulation. Most people are deficient, especially in northern latitudes.
Strong	Vitamin K1	The primary form of vitamin K found in plants, essential for blood clotting. Also supports bone health to a lesser extent than K2.
Strong	Vitamin K2	Directs calcium to bones and teeth while preventing arterial calcification. Critical partner for vitamin D3 supplementation.
Strong	Magnesium Citrate	Well-absorbed magnesium form with mild laxative properties.
Strong	Magnesium Glycinate	One of the most bioavailable and gentle forms of magnesium (Mg citrate is comparably bioavailable). Excellent for relaxation, sleep, and muscle recovery. Less likely to cause GI issues than other for...
Moderate	Manganese	Essential trace mineral for bone formation, blood clotting, and metabolism.
Moderate	Strontium	Trace element that supports bone density by stimulating osteoblasts and inhibiting osteoclasts.

Vitamin D3 for Bone support

Supplement

Vitamin D3

Dose

2,000-4,000 IU daily

Form

D3 (cholecalciferol)

Timing

With the largest meal

Notes

Often paired with Vitamin K2 and adequate calcium/magnesium intake; doses above 4,000 IU/day should be clinician-directed.

Vitamin C for Collagen support

Supplement

Vitamin C

Dose

500-1,000 mg daily

Form

Liposomal vitamin C or ascorbic acid

Timing

With collagen-containing meal or supplement

Notes

Use consistently when the goal is skin or connective tissue support.

Calcium for Bone support

Supplement

Calcium

Dose

500-1,000 mg daily in divided doses

Form

Calcium citrate

Timing

With meals or split between meals

Notes

Absorption plateaus above about 500-600 mg at once.

Vitamin K2 for Bone support with vitamin D3

Supplement

Vitamin K2

Dose

100-200 mcg daily

Form

MK-7

Timing

With a meal containing fat

Notes

Avoid self-starting if you take warfarin or another vitamin K-sensitive anticoagulant.

Vitamin K2 for Calcium handling support

Supplement

Vitamin K2

Dose

90-180 mcg daily

Form

MK-7

Timing

With dinner

Notes

Typically paired with vitamin D3 rather than used alone.

Vitamin K2 MK-4 for Bone support

Supplement

Vitamin K2 MK-4

Dose

5-15 mg daily

Form

MK-4

Timing

Split 2-3 doses with meals

Notes

MK-4 is short acting and often dosed more than once daily.

Vitamin K2 MK-4 for Dental and bone-focused support

Supplement

Vitamin K2 MK-4

Dose

5-10 mg daily

Form

MK-4

Timing

With meals

Notes

Shorter half-life than MK-7; consistency matters.

Vitamin K2 MK-4 for High-dose K2 protocols

Supplement

Vitamin K2 MK-4

Dose

15-45 mg daily

Form

MK-4

Timing

Divided with meals

Notes

Reserve higher intakes for clinician-guided use.

Collagen Peptides for Tendon and ligament support

Supplement

Collagen Peptides

Dose

15 g daily

Form

Hydrolyzed collagen peptides

Timing

30-60 minutes before rehab or training

Notes

Consistency matters more than cycling.

Collagen Peptides for Bone support

Supplement

Collagen Peptides

Dose

10-20 g daily

Form

Hydrolyzed collagen peptides

Timing

Any consistent time

Notes

Works best as part of a broader protein, mineral, and resistance-training plan.

Glycine for Collagen support

Supplement

Glycine

Dose

3-5 g daily

Form

Pure glycine powder

Timing

Any consistent time

Notes

Can complement collagen peptides rather than replace them.

2 claims reviewed

Tier	Claim	One-liner
Moderate evidence	Vitamin D3 protects bone health	Necessary, not sufficient.
Moderate evidence	Vitamin K2 supports bone density and reduces fracture risk	Most defensible in postmenopausal women.

Documented interactions in this category

Calcium binds many medications (levothyroxine, bisphosphonates, fluoroquinolones, iron). The checker flags every timing-sensitive pairing.

Across the substances above, the public database has 226 documented pairings that touch at least one of them. Open the free interaction checker to scan a full routine.