Supplement
Definition 1 of 3
Pro Tip 1/3
Fill the Gap
Use 'supplement' to describe adding what's lacking to improve the whole. An omega-3 supplement can fill the nutritional gap in a vegan diet.
Pro Tip 2/3
Not a Replacement
'Supplement' suggests addition, not substituting an essential element. I take a calcium supplement, not as a replacement, but alongside my regular meals.
Pro Tip 3/3
Improve Effectiveness
Emphasize how 'supplement' is used to complement and enhance effectiveness. The training program was supplemented with practical examples to make it more effective.