The calcium from food is more digestible and more absorbable according to peer-reviewed studies. I'm trying to get more calcium into daily eating plan but taking a "bone support" supplement to make up any shortfall. I think it's hard to follow recommendations perfectly, not the least because they keep changing on us ;-).

AlgaeCal is a plant based supplement and is highly rated with proof positive it can increase bone density. Has a moneyback guarantee. Base dexascan within 30 days of starting supplement compared to dexa on same machine 6 months later. No, I'm not affiliated. Just been doing a ton of research.