1) Acting as a synergist 2) Interacting 3) Interactive 4) Producing synergism 5) Working together 1) Interactive 2) Synergetic 
• (a.) Of or pertaining to synergism. • (a.) Cooperating; synergetic.
acting together; enhancing the effect of another force or agent.
In medicine, describes the interaction of two or more drugs when their combined effect is greater than the sum of the effects seen when each drug is given alone.
“The whole is greater than the sum of the parts”. Often achieved by blending essential oils – the result is usually more effective than you would achieve by using each oil individually. See our Essential Oil Blends.
<pharmacology, physiology> Acting together, enhancing the effect of another force or agent. ... (19 Jan 1998) ... 
The action of two or more substances achieving an effect greater than that possible with any of the individual components, i.e., the sum being greater than the parts. In cancer medicine, this refers to the potentiation of one drug by one or more additional agents when administered together.
The action of two or more substances achieving an effect greater than that possible with any of the individual components.
Syn`er·gis'tic adjective 1. Of or pertaining to synergism. 'A synergistic view of regeneration.' Shedd. 2. Coöperating; synergetic. 
Type: Term Pronunciation: sin′ĕr-jis′tik Definitions: 1. Pertaining to synergism. 2. Denoting a synergist. Synonyms: synergetic, synergic
(sin;er-jis;tik) Pertaining to regulatory processes or molecules (such as hormones) that have complementary or additive effects.
[adj] - of or relating to the theological doctrine of synergism 2. [adj] - used especially of drugs or muscles that work together so the total effect is greater than the sum of the two (or more)
interactive adjective used especially of drugs or muscles that work together so the total effect is greater than the sum of the two (or more)
working in cooperation
Two or more drugs which enhance the effectiveness of each other.
pertaining to, characteristic of, or resembling synergism: a synergistic effect. · acting as a synergist; producing synergism; interacting. · of or pertaining to theological synergism or synergists.