Which supplement works better to increase muscle mass: betaine or vitamin d3?

Ratings at a Glance

Supplement	Effectiveness Rating	Confidence Rating
Betaine
Vitamin D3

Effectiveness Rating: Betaine vs Vitamin D3

The effectiveness rating is a measure of the supplements' ability to increase muscle mass. This rating answers the question of whether or not a supplement does what it claims. The evidence shows betaine is better than vitamin d3 in its ability to increase muscle mass. Betaine should provide some positive results while vitamin d3 will not.

Confidence Rating: Betaine 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 betaine and vitamin d3 have low confidence ratings. This means neither supplement has an adequate amount of research to back up this claim. A low confidence rating questions the validity of the effectiveness rating.