Certain published study results have found that LLLT can cause negative reactions when an inappropriate choice of light source or an inappropriate dosage is used. There is an optimal dose of light for any particular application, and in the case of red light therapy, often lower doses are found to be more effective than higher doses. Be sure to work with a qualified LLLT practitioner whenever receiving treatments, and report any side effects, including burning, swelling, dizziness, muscle weakness or nausea. Keep in mind that seeing results from red light treatments might take patience and that responsiveness is expected to vary.
Salicylates are derivatives of salicylic acid that occur naturally in plants and serve as a natural immune hormone and preservative , protecting the plants against diseases , insects , fungi , and harmful bacteria . [ citation needed ] Salicylates can also be found in many medications , perfumes and preservatives. [ citation needed ] Both natural and synthetic salicylates can cause health problems in anyone when consumed in large doses, [ citation needed ] but for those who exhibit salicylate sensitivity (also known as salicylate intolerance ), even small doses of salicylate can cause adverse reactions.