Supplement × Supplement·Evidence index
PubMed indexes 8 records that name Soy Isoflavones and Vitamin D3 together, either in the title or in an interaction, co-administration, or pharmacokinetic context. Each one is listed below with its study design and, where the abstract states one, the authors’ own conclusion, quoted and linked. This page reports that literature. It does not tell you whether to combine them.
Every statement below is attributed to a named, dated, linked source.
This page lists published research relevant to Soy Isoflavones and Vitamin D3. It deliberately does not state whether the combination is safe, whether it interacts, in which direction, at what dose, or how far apart to take them.
Strongest relevance first: papers naming both substances in the title, then human trials and systematic reviews.
“This study suggests combined supplementation of soy isoflavones and active vitamin D can improve some biochemical parameters regarding inflammation and intestinal permeability of IBS in women.”
Names both Soy Isoflavones and Vitamin D3 in its title.
“This observational trial suggests a possible beneficial effect of a dietary soy supplement containing 40 mg of isoflavone/day plus inulin in the management of menopausal symptoms such as hot flashes.”
Names both Soy Isoflavones and Vitamin D3 in its title.
“The controlled study showed the efficacy of Magnolia extract and magnesium on psycho-affective and sleep disturbances in menopause, in addition to the effects of isoflavones on vasomotor symptoms. A global natural approach to menopause with ES evidenced its therapeutic usefulness and safety.”
Names both Soy Isoflavones and Vitamin D3 in its title.
“In this first study testing the combination of a single, large dose of cholecalciferol and daily genistein, the agents were well tolerated. While an increase in AR expression suggesting differentiation was observed, it is difficult to draw firm conclusions regarding the bioactivity of the combination given the sample size.”
Names both Soy Isoflavones and Vitamin D3 in its title.
Names both Soy Isoflavones and Vitamin D3 in its title.
“Treatment with soy isoflavones might be an alternative to hormone replacement therapy in decreasing bone loss from postmenopausal estrogen deficiency. In addition, there are further effects on increasing transcription factor osterix expression and preosteoblast proliferation when these were combined with vitamin D3.”
Names both Soy Isoflavones and Vitamin D3 in its title.
“In addition, supplemental calcium and vitamin D(3), beyond normal dietary intake do not enhance the effects of genistein on improving measures of bone loss. This observation has implications regarding the use of calcium and vitamin D(3) supplementation.”
Names both Soy Isoflavones and Vitamin D3 in its title.
“Because the serum genistein concentrations achieved during pharmacokinetic testing at therapeutic doses were well below those required for enzyme inhibition in the in vitro liver microsome assays, these results indicate a low potential for drug interactions.”
Names both Soy Isoflavones and Vitamin D3 in its title.
Search-based evidence indexes have real limits, and it is worth being explicit about them:
NutriStack is a free iPhone app for organising a supplement routine: what you take, when, and what the published record says about it. Its exploratory interaction checker covers Soy Isoflavones, Vitamin D3, and several hundred other substances.
The checker is a research and organisation tool, not a clinical decision aid, and its per-pair assessments are excluded from search until they pass claim-level review.
NutriStack is an informational and organizational tool, not a medical service, and not a substitute for professional advice. Always consult a qualified healthcare professional before starting, stopping, or changing any supplement or medication.
