Bone Support
Best-in-class: Oscap
Thorne Oscap. Per two capsules the filed panel declares calcium 300 mg as dicalcium malate, magnesium 100 mg as dimagnesium malate, pyridoxal 5-phosphate 20 mg, boron 3 mg as a glycinate complex, vitamin D3 25 mcg, folate 166.6 mcg DFE as L-5-methyltetrahydrofolate and methylcobalamin 50 mcg. Oscap contains no vitamin K. Oscap Plus is a separate SKU carrying 200 mcg of K1 and 200 mcg of K2, so the two bottles are 400 mcg of vitamin K a day apart.
Bone Support quick facts
| Suggested dose | As directed, split through the day. |
| How often | Daily, split |
| Who it's for | Bone health — post-menopausal women, older adults, low-dairy diets. |
The right shape for bone support, because calcium alone is close to useless and possibly harmful — supplemental calcium without K2 has been associated with arterial calcification in some analyses. The K2 inclusion is what makes a bone formula defensible. Mechanical loading remains the strongest osteogenic stimulus and nothing here substitutes for it.
How Bone Support actually works
Bone is a living tissue in constant turnover, and this formula supplies substrate for the building side of it: 300 mg of calcium and 100 mg of magnesium as the mineral, vitamin D3 for intestinal absorption, boron as a cofactor, and pyridoxal 5-phosphate, methylfolate and methylcobalamin, which are the three cofactors that dispose of homocysteine — a real and under-discussed determinant of collagen cross-linking. The calcium is a deliberate undershoot at roughly a quarter of a day's requirement. Osteocalcin carboxylation is the step this formula does not cover, because there is no vitamin K in it.
Where to get Bone Support
Buy Oscap at Thorne →The evidence for Bone Support
Graded by what exists behind each claim.
✅ Clinically validated
- Calcium + vitamin D + K2 combinations support bone mineral density and reduce fracture risk in at-risk groups (RCT-supported).
- Provides the full mineral matrix, not just calcium.
📊 Correlative data
- Bone density declines with age, especially post-menopause and with low weight-bearing activity.
🧪 Theoretical / extrapolated benefits
- Full-matrix dosing (with K2/boron) is proposed to outperform calcium alone — mechanistically reasonable.
How to read these tiers: they say how much human evidence exists, not how well something works — and ✗ flags harm, never a disappointing trial. How the evidence tiers work →
What Bone Support actually does
Bone is a composite material and the marketing only ever describes half of it. Type I collagen fibrils are the tension member; carbonated hydroxyapatite crystallized along those fibrils is the compression member. A skeleton fails when either half fails, and the two halves need completely different nutrients. This formula, unusually, contains ingredients for both — and the card describes neither correctly.
What calcium and vitamin D actually do, which is not becoming bone. 1,25-dihydroxyvitamin D binds the vitamin D receptor and raises intestinal calcium absorption through TRPV6 and calbindin. When absorbed calcium is adequate, parathyroid hormone secretion falls. PTH is the signal that puts RANKL on the osteoblast surface, RANKL activates the osteoclast, and the osteoclast dissolves mineral with a V-ATPase proton pump and digests the collagen underneath it with cathepsin K. So the bone-sparing mechanism of dietary calcium is suppression of resorption, not supply of raw material. That distinction predicts exactly who benefits: someone whose PTH is raised because their intake is low.
Magnesium is upstream of the whole axis. It is the cofactor for the hepatic 25-hydroxylase and renal 1-alpha-hydroxylase steps that activate vitamin D, and it is required for PTH secretion and for target-tissue response to it. Severe magnesium depletion produces functional hypoparathyroidism and a hypocalcemia that will not correct with calcium until the magnesium is replaced. That is why magnesium belongs in a bone formula, and it is a better reason than the one usually given.
Boron has a named human experiment behind it, and it is a hormonal one. Twelve postmenopausal women aged 48 to 82 were fed a low-boron diet and then supplemented with 3 mg a day; the supplementation markedly raised serum 17-beta-estradiol and testosterone Nielsen 1987. Estradiol restrains osteoclasts, so a steroid-hormone route is a coherent mechanism for a trace element in a bone product. It is also a 1987 metabolic-ward study in twelve people, and the 3 mg in this capsule is exactly the dose it used.
And here is the half of this bottle nobody explains: it is a collagen cross-linking formula. The filed label carries pyridoxal 5-phosphate 20 mg, methylfolate and methylcobalamin US National Institutes of Health — the three cofactors that dispose of homocysteine, through cystathionine beta-synthase and methionine synthase. Homocysteine interferes with the lysyl oxidase-dependent cross-linking that turns loose collagen into a load-bearing lattice, and raised homocysteine tracks with fracture independently of bone density. That is a bone quality mechanism rather than a bone quantity one, it is why B vitamins are in a bone product, and no DXA scan can see it.
Cell, rodent, human — and where it stops
The calcium and vitamin D question has been answered at scale, and the answer is not the one on the box. A systematic review and meta-analysis of 33 randomized trials in 51,145 participants found that supplements containing calcium, vitamin D, or both were not associated with a lower risk of fracture among community-dwelling older adults Zhao 2017. That is the population buying this product. The trials that did show fracture reduction were largely in institutionalized, frail or frankly deficient people, and generalizing from them to a healthy 55-year-old is the single commonest error in this category.
More vitamin D is not more bone, and there is a randomized trial with the opposite result. Three hundred and eleven community-dwelling healthy adults took 400, 4,000 or 10,000 IU of vitamin D3 daily for three years: the 4,000 and 10,000 IU groups ended with statistically significantly lower radial bone mineral density than the 400 IU group Burt 2019. This formula's 25 micrograms — 1,000 IU US National Institutes of Health — sits at the sane end of that curve, which is a point in its favor and an argument against the 5,000 IU capsule somebody is stacking on top of it.
The homocysteine hypothesis was tested properly, and it failed. B-PROOF randomized 2,919 people aged 65 and over with elevated plasma homocysteine to 500 micrograms of vitamin B12 plus 400 micrograms of folic acid daily for two years. Osteoporotic fractures occurred in 61 people (4.2%) on treatment and 75 (5.1%) on placebo van Wijngaarden 2014 — a difference that did not reach significance. So the mechanism above is real biochemistry with a null clinical trial attached, and this page says so rather than stopping at the mechanism.
The boron evidence never left the metabolic ward. Twelve women, a controlled low-boron diet, 3 mg a day, and hormone measurements Nielsen 1987. No fracture trial. No bone density trial. The 3 mg in this capsule is the dose from that study and it is carrying the entire boron claim in the category.
The obstacle is not absorption for once — it is that the outcome trials are null in the people who buy it. Every ingredient here is absorbed, and the salts chosen are the well-absorbed ones US National Institutes of Health. What is missing is a demonstration that topping up a reasonably fed, community-dwelling adult changes a fracture rate Zhao 2017 van Wijngaarden 2014. The mechanism is sound and the population is wrong, and that is a different failure from the one the rest of this shelf has.
Which leaves one honest role, and it is a real one. If your diet is genuinely low in calcium, your 25-hydroxyvitamin D is low, or your PTH is raised, this formula corrects the input that is driving resorption. If none of those is true, the trials say to expect nothing, and the strongest bone intervention available to you is loading the skeleton.
Bone Support — which form, and does it matter
Read the filed label, because the category description is wrong about this product. The Supplement Facts panel on record lists, per two capsules: vitamin D3 25 mcg, pyridoxal 5-phosphate 20 mg, folate 166.6 mcg DFE as L-5-methyltetrahydrofolate, methylcobalamin 50 mcg, calcium 300 mg as dicalcium malate, magnesium 100 mg as dimagnesium malate, and boron 3 mg as a boron glycinate complex US National Institutes of Health. There is no vitamin K in it. There is no strontium in it. There are no “trace minerals” beyond the boron.
That matters because the warnings attached to this category belong to a different bottle — including one from the same brand. Oscap Plus is a separate product and its filed panel does carry vitamin K: 200 micrograms of K1 plus 200 micrograms of K2, alongside 300 mg of ipriflavone US National Institutes of Health. So the “keep your vitamin K intake consistent if you take warfarin” warning is correct — for Oscap Plus. Applied to Oscap it is a caution about an ingredient that is not present, and somebody switching between the two SKUs changes their daily vitamin K by 400 micrograms without noticing.
Malate salts are the right choice and here is the mechanism. Calcium carbonate needs gastric acid to dissolve, so it is the wrong salt for anyone on a proton pump inhibitor or an H2 blocker, and for many people over 70. Dicalcium malate and dimagnesium malate are organic-acid salts that dissolve without that help. Magnesium malate also loosens stools less than the oxide, which is the practical difference most people notice.
300 mg of calcium is a deliberate undershoot, and it is correct. That is roughly a quarter of a day's requirement US National Institutes of Health, designed to top up food rather than replace it — which is the right design given that the cardiovascular signal in the meta-analysis attached to supplemental calcium at 500 mg a day and above Bolland 2010. A bone formula delivering 1,200 mg in one hit would be a worse product, and most of them do.
The folate is methylfolate, not folic acid, and the distinction is real. L-5-methyltetrahydrofolate is the circulating form and bypasses the dihydrofolate reductase step that limits folic acid conversion; it also avoids accumulating unmetabolized folic acid. B-PROOF used folic acid van Wijngaarden 2014, so strictly speaking the null trial tested a different molecule — which is a fair point in the product's defense and not one that rescues a null fracture result.
What would have to be true, and how you would know it was not
1. 25-hydroxy vitamin D is the input check, and 1,000 IU has a predictable size of effect. Predict a rise of roughly 10 ng/mL from a low baseline over 12 weeks on 25 micrograms a day US National Institutes of Health, and predict much less than that if you started in the normal range, because the dose-response flattens. Retest vitamin-d at 12 weeks, not sooner.
2. The pth-calcium axis tells you whether the product has a job at all. If your parathyroid hormone was raised because calcium and vitamin D intake were inadequate, predict it falls over 12 weeks. If PTH was already mid-range, predict no change — and that null result is the honest signal to stop, because the mechanism this formula works through is suppression of a resorption signal that you do not have.
3. Predict homocysteine falls and predict the fracture benefit does not follow. Twenty milligrams of P5P with methylfolate and methylcobalamin US National Institutes of Health will move homocysteine in most people who start high, within 8 to 12 weeks. Then hold that against B-PROOF, where 2,919 people had homocysteine lowered for two years and osteoporotic fractures were 4.2% against 5.1% van Wijngaarden 2014. A marker moving is not an outcome moving, and this is the cleanest example of that distinction on the whole site.
4. The prediction that cuts hardest against the product. Predict that a repeat DXA in 12 months shows no change, and that any change you are shown is within the scanner's precision error of about 1 to 2%. The meta-analytic answer for community-dwelling adults is that supplements of this class do not reduce fractures Zhao 2017, and osteocalcin is a turnover marker rather than a density one — it can move while density does not.
5. And predict that more vitamin D makes it worse, not better. Anyone tempted to stack a 5,000 IU capsule on top of this should know that three years at 4,000 and 10,000 IU produced lower radial bone density than 400 IU in a randomized trial Burt 2019. The falsifiable version: if high-dose D were better for bone, the high-dose arms of that trial would have won. They lost.
What nobody has tested yet
Nobody has tested this combination. Not this one and not a close analog. Every citation on this page belongs to a single ingredient or a single pair Zhao 2017 Nielsen 1987 van Wijngaarden 2014, and the assumption that a mineral formula plus a methylation formula adds up has never been examined.
Nobody has run boron with a bone endpoint. The whole case is a hormone measurement in twelve women in 1987 Nielsen 1987. A two-year trial of 3 mg of boron against placebo on bone turnover markers in postmenopausal women would be cheap, would settle a claim that appears on hundreds of labels, and has not been done.
Nobody has looked at bone quality rather than bone density in the homocysteine question. B-PROOF measured fractures and found nothing van Wijngaarden 2014, but the mechanism predicts a change in collagen cross-linking, which is measured by pyridinoline cross-link assays and by bone material strength index — not by DXA. The right endpoint has never been used, which means the hypothesis is bruised rather than dead.
And nobody has run the trial that would actually justify this product: a fracture trial restricted to people who are deficient. Enroll only adults with low calcium intake, low 25-hydroxyvitamin D and raised PTH; supplement to adequacy; follow fractures. The mechanism predicts a benefit in exactly that group and the null meta-analyses are dominated by everyone else Zhao 2017.
Bone Support — its own safety story, not its category's
Count the calcium across everything, and the reason is a number. A meta-analysis of 15 trials found 143 myocardial infarctions among people allocated to calcium supplements against 111 on placebo — hazard ratio 1.31, 95% CI 1.02 to 1.67, P = 0.035 — at doses of 500 mg a day and above over a mean 4 years Bolland 2010. This product supplies 300 mg US National Institutes of Health, which is under that threshold on its own and is not under it once you add a second calcium-containing product or a calcium-fortified drink.
The B6 is the ceiling in this bottle that nobody watches. Twenty milligrams of pyridoxal 5-phosphate per serving US National Institutes of Health is modest against the 100 mg adult upper limit — but B6 is in B-complexes, in energy drinks, in magnesium-plus-B6 products and in most premenstrual formulas, and chronic high intake causes a sensory peripheral neuropathy that presents as numb, tingling feet and is only partly reversible. Add the labels up before adding another one.
The boron raises sex hormones, which is a reason to think rather than a reason to panic. 3 mg raised serum 17-beta-estradiol and testosterone in the study this dose comes from Nielsen 1987. In an estrogen-receptor-positive breast cancer history, or on an aromatase inhibitor, that is a conversation to have rather than an ingredient to take because it was in a bone formula.
Vitamin K: the warning is right and the product is wrong for it. Oscap contains no vitamin K US National Institutes of Health; Oscap Plus contains 400 micrograms of it US National Institutes of Health. Anyone on warfarin should read which one is in their cupboard, because the interaction is real for one SKU and irrelevant for the other, and the names differ by a single word.
Strontium is not in this product, and the warning is still worth knowing. Strontium substitutes for calcium in the crystal, has a higher atomic number, and therefore inflates a DXA reading without adding strength — which is why it defeats the monitoring it appears to improve. It is in some bone blends. It is not in this one US National Institutes of Health, and repeating the warning here as though it were would be telling you to check for something that is not there.
And the honest hierarchy: this is the third-best thing you can do for a skeleton. Loading it is first, not smoking and not being underweight is second. In someone with established osteoporosis, a mineral formula is adjunctive to drug treatment that has fracture trials behind it, and treating it as an alternative is the failure mode with the highest cost on this page.
Sources read for this page
- US National Institutes of Health, Office of Dietary Supplements. Dietary Supplement Label Database record 182553 — Oscap (Thorne), Supplement Facts panel. NIH Dietary Supplement Label Database
- US National Institutes of Health, Office of Dietary Supplements. Dietary Supplement Label Database record 20525 — Oscap Plus (Thorne Research), Supplement Facts panel. NIH Dietary Supplement Label Database
- Nielsen FH, et al. Effect of dietary boron on mineral, estrogen, and testosterone metabolism in postmenopausal women. The FASEB Journal, 1987 · PMID 3678698
- Zhao JG, et al. Association Between Calcium or Vitamin D Supplementation and Fracture Incidence in Community-Dwelling Older Adults: A Systematic Review and Meta-analysis. JAMA, 2017 · PMID 29279934
- Burt LA, et al. Effect of High-Dose Vitamin D Supplementation on Volumetric Bone Density and Bone Strength: A Randomized Clinical Trial. JAMA, 2019 · PMID 31454046
- Bolland MJ, et al. Effect of calcium supplements on risk of myocardial infarction and cardiovascular events: meta-analysis. BMJ, 2010 · PMID 20671013
- van Wijngaarden JP, et al. Effect of daily vitamin B-12 and folic acid supplementation on fracture incidence in elderly individuals with an elevated plasma homocysteine concentration: B-PROOF, a randomized controlled trial. The American Journal of Clinical Nutrition, 2014 · PMID 25411293
How you would know if it worked
Bone density is a scan rather than a blood test, but every ingredient in this formula acts through numbers that are. The osteocalcin page on this site prescribes exactly what is in the bottle — vitamin D to 40-60 ng/mL, K2 to direct calcium into bone, magnesium and adequate calcium — so 25-hydroxy vitamin D shows whether the dose is landing, the parathyroid-calcium axis shows whether calcium status is good enough to stop the body borrowing from the skeleton, and osteocalcin tracks the bone-building side of turnover.
- Vitamin D (25-Hydroxy) Retest: 8–12 weeks after a dose change; then every 6–12 months.
- Parathyroid Hormone & Calcium Retest: Annually if abnormal, or after correcting vitamin D.
- Osteocalcin Retest: Annually if monitoring bone health.
The cheapest panel carrying Vitamin D (25-Hydroxy) and at least one other of these is Vitamin D That Won't Come Up, at $137 — the panel is named for a different question, and the marker is the same marker. That is the whole cost of finding out.
Draw before you start, not after. A result with nothing to compare it to answers nothing.
Bone Support — safety & side effects
- Oscap is calcium 300 mg, magnesium 100 mg, boron 3 mg, vitamin D3 25 mcg and three methylation cofactors per two capsules. There is no strontium in it — the DXA-inflation problem belongs to strontium products, and this is not one.
- Count the calcium toward your total, including diet. Supplemental calcium above ~1,000 mg/day has cardiovascular and stone associations.
- Oscap contains no vitamin K at all, so it does not interact with warfarin. Oscap Plus does: 200 mcg of K1 plus 200 mcg of K2 per serving. Switching between the two SKUs on warfarin is a 400 mcg daily swing in vitamin K, which is exactly the thing an INR is sensitive to.
The same on every page it applies to. Read it here; it is not repeated research.
- This is one formula with several actives, and it carries the combined safety profile of everything on its panel — the risks do not average out, they add. Check the panel above against anything else you take, because the commonest way to overdose an ingredient is to meet it twice in one day under two different product names.
Not medical advice. If you take prescription medication or have a diagnosed condition, check this against it with a pharmacist or doctor — pharmacists are underused and free.
- When to take it, and what to take it with
- Which form actually absorbs
- Who it's worth it for
- Best-in-class brand pick
- Coach Cam's stacks and notes
- Fasted or with food, and when in the day
- Morning or night, and why that window
- Around training, or deliberately away from it
- What it must not share a window with
Everything above is free and stays free. Skool is where it becomes a plan — Bone Support in an order, with the rest of what you're running.
Unlock in Skool — $10/mo →Bloodwork to run alongside Bone Support
Baseline first, then again at 8–12 weeks.
| Marker | What it’s watching for |
|---|---|
| Ferritin | Below 50 and hair and skin repair suffer, whatever else you take |
| Vitamin D (25-Hydroxy) | Skin, bone and connective tissue all depend on it |
| TSH (Thyroid-Stimulating Hormone) | Thyroid disease shows in hair, skin and nails first |
| Zinc, Plasma | Deficiency causes poor wound healing and hair shedding |
The Basics — Start Here panel covers these in one order — 4 markers, $32.40 with the discount applied.
Check results you already have → · All 103 markers A–Z
Bone Support — frequently asked questions
What is Bone Support?
Thorne Oscap. Per two capsules the filed panel declares calcium 300 mg as dicalcium malate, magnesium 100 mg as dimagnesium malate, pyridoxal 5-phosphate 20 mg, boron 3 mg as a glycinate complex, vitamin D3 25 mcg, folate 166.6 mcg DFE as L-5-methyltetrahydrofolate and methylcobalamin 50 mcg. Oscap contains no vitamin K. Oscap Plus is a separate SKU carrying 200 mcg of K1 and 200 mcg of K2, so the two bottles are 400 mcg of vitamin K a day apart.
What is the suggested dose of Bone Support?
As directed, split through the day. This is a general reference for education only — statements have not been evaluated by the FDA and this is not medical advice.
Where can I find Bone Support dosing and the full breakdown?
The suggested dose and the full evidence — clinical, correlative and theoretical — are on this page. What's inside Skool is when to take it, which form actually absorbs, the brand worth buying and Coach Cam's stacks.
Where can I buy Bone Support?
Coach Cam sources Bone Support from Thorne, with 10% off auto-applied at checkout — use the buy link on this page.
What Bone Support is used for
Bone Support appears under 3 goals in the goal router.
Related Skin & Structural supplements
Where this goes next
The pages here are the frameworks. The protocols — the dosing, the order to correct things in, the week-by-week schedule and what to retest — are inside Skool.