The majority of reviews for Power to Sleep PM are mixed
with a bias toward the positive, indicating that the product somewhat delivers
on its lofty claims. But, as we mentioned earlier, melatonin does work, so we would expect that it would work for some people, particularly if they've not used melatonin before and the smaller dose would be effective.
The negative reviews of irwin naturals power to sleep largely said that the product didn't work, and that users had previously taken more effective sleep aids.
A few mid rated reviews mentioned that they have to take additional melatonin, or that Power to Sleep PM helps them fall asleep, but not stay asleep. Which is what we'd expect from GABA and Melatonin doses being on the low side.
1 - https://www.nccih.nih.gov/health/melatonin-what-you-need-to-know
2 - https://www.ncbi.nlm.nih.gov/books/NBK513311/
3 - https://www.nccih.nih.gov/health/passionflower
4 - https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9017334/
5 - https://pubmed.ncbi.nlm.nih.gov/32818573/
6 - https://www.nccih.nih.gov/health/flaxseed-and-flaxseed-oil
7 - https://ods.od.nih.gov/factsheets/Valerian-HealthProfessional/
8 - https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4245564/
9 - https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8868281/