A 3% dilution is excellent for acute conditions. What defines an acute condition? Pain, cold/flu, sprains, stomach aches and muscle strains would be on my list of acute conditions. The caveat of a 3% dilution is that you really should only use it for two weeks. Remember that for every action there is a reaction. There can be side effects with essential oils and 2 weeks is an appropriate amount of time to use a 3% dilution for therapeutic response.
Remember to consider your health conditions before you choose your dilution ratio. Anyone with pulmonary (lung) issues including asthma, immunosuppression, seizure disorders or heart disease (including high blood pressure) or are under 12 years of age should consult a physician, naturopath or clinical aromatherapist for guidance.
A 3% dilution is 15-18 drops in a carrier as described in parts one and two of this blog. Please be mindful of your dilution rates. Safety is so important!