Yes, it is possible to use red light therapy several times a day. In the first place, it is about the total dosage over the day being sufficient. If you don't have enough time for a full light therapy treatment, it is fine to split it into two sessions. There are also certain painful conditions, such as osteoarthritis, when it is probably smart to divide the treatment, as the pain-relieving effect of red light therapy is at its greatest immediately after treatment and in the first few hours.
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What time of day can I use red light therapy?
Does it make sense to use light therapy even in the summer?