Which supplement works better to increase strength: soy protein or vitamin d3?

Ratings at a Glance

Supplement	Effectiveness Rating	Confidence Rating
Soy Protein
Vitamin D3

Effectiveness Rating: Soy Protein vs Vitamin D3

The effectiveness rating is a measure of the supplements' ability to increase strength. This rating answers the question of whether or not a supplement does what it claims. The evidence backing up soy protein is great, while the evidence backing up vitamin d3 is good. Soy Protein should be able to increase strength more effectively, however both supplements should provide positive results.

Confidence Rating: Soy Protein vs Vitamin D3

Another factor to take into account when comparing supplements is the confidence rating. This rating is a measure of how valid each supplement's effectiveness rating is. Remember, the confidence rating is a measure of how much you can trust the effectiveness rating. This rating is based on how many studies are included in the database on a supplement's claims. Ideally, you want a high effectiveness AND confidence rating.

Both soy protein and vitamin d3 have great confidence rating. This means both supplement's effectiveness ratings above are valid.