@BearWithMe said:

Currently I'm supplementing calcium by eating bone meal.

Fine to get collagen. useful.
When eating meat with Ca carbonate, the assimilation is not fine.
Ca from cheese (Gouda to get vit K2), or from broccoli flowers (60 % assimilated from broccoli).
I target 850 mg Ca on my software. Minimum 650 mg if there is enough potassium (acid-base balance).
I try to moderate P (phophorus) and Na when I eat cheese. Must be balanced with geens and fruit to avoid excitation of PTH (thyroid and stress hormone).
I would manage my stress with sophrology or EFT + magnesium bisglycinate powder (1.25 g powder after a stressful event, not before). 2 or 3x/day. Mind the kind you chose.

@BearWithMe said:

What do you think about this product?

This colloidal silica: 1 % is absorbable.
Explanation on this link, in French (translator required):
https://mirzoune-ciboulette.forumactif.org/t2237-silicium-la-taille-et-la-concentration-changent-tout#31043

Useful link on my forum (search with the word silicium):

1. https://mirzoune-ciboulette.forumactif.org/t2237-silicium-la-taille-et-la-concentration-changent-tout#31043
2. https://mirzoune-ciboulette.forumactif.org/t2194-le-silicium-peut-se-polymeriser-et-cristalliser#30769 => degree of biodisponibility of different forms of silicon (4 mains forms). Examples of different forms.

This one on iherb.com:
*) Silica collagen builder de Living Silica - Dr. Mercola. (catégorie 1: MMST)
10 mg per caps. 60x.
Excipient : acacia gomme, cellulose (HMPC)
+/ 27 €
Mine is G5 LLR (liquid) from Ireland (4 x 500 ml, one of which is offered; without excipient).
https://llrg5.com
=> G5 is the kind "MMST" (mono-méthyl-silane-triol)

What do you think about this product? It contain 20mg of silica per 1ml. Probably not organic, though? https://geosilica.com/products/pure-natural-silica-minerals

Currently I'm supplementing calcium by eating bone meal. I assumed it might be more bioavailable than other forms. The problem is that it contains equal amount of calcium and phosphorus, so it doesn't help with Ca:P ratio at all. Should I supplement calcium carbonate instead? I eat a lot of meat so my Ca:P ratio is not very good

@BearWithMe said:

I have neck so tense it is almost like constant neck cramp.

Hi,
T-shirt Percko
https://www.percko.com/products/tshirt-discret-homme
Back posture corrector with support for the back and shoulders (a strapped garment).
Check whether it has been approved by a health authority or an equivalent body.
Note: This will not be sufficient if there is a vertebral collapse. I would take organic silicon and monitor my calcium/phosphorus (Ca/P) balance. And not silica derived from nettle (only 3% of which is assimilable). I can provide more details and a link if you would like to learn more about the benefits of silicon, especially if you are over 40.
I would also use 5 drops of Lavandula x intermedia (lavandin super) essential oil, combined with 5 drops of andiroba oil, diluted in a skincare cream.