Several studies backing up LLLT devices. Should we believe them?

[Vantage]

I was quite surprised to see several studies on LLLT devices backing up their efficacy.

The latest one seems to be iRestore, but afaik it has not been published yet.
https://clinicaltrials.gov/ct2/show/NCT03331003

The Growth of Human Scalp Hair Mediated by Visible Red Light Laser and LED Sources in Males
https://www.ncbi.nlm.nih.gov/pubmed/24078483

The growth of human scalp hair in females using visible red light laser and LED sources
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4265291/

Low-Level Laser (Light) Therapy (LLLT) for treatment of hair loss
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3944668/

Can we believe these studies?