I don't disagree with that theoretically especially for maintenance, but we lack studies and the health food industry is not always meticulous in its preparations.
We all, including me, or at least most of us are likely to get discouraged though when trying natural remedies that don't actually indicate regrowth. From my own experience, the number one natural maintenance substance is either polysorbate 60 or polysorbate 80. They went out of fashion because the "sebum plug" baldness theory proved not to describe how they work or any other mechanism by which they might work. I have written that it might be because they work similarly to ketoconozole and lower hair loss in a way that is difficult to articulate but may be due to their effects on reducing scalp inflammation by yeast, namely, furfur.
My rule of thumb is however, that if we are using a natural remedy as a substitute for a pharmaceutical one, it is likely to have sides as well and also likely to be less efficacious and what many of us might characterize as a "waste of time". Largely, I have avoided such meds besides saw palmetto because there are a lot of obvious parallels with people on HRT, many of whom start off with phytochemicals and puira and saw palmetto and who see little to no difference in their visages or externally body-wise.
I did go through a phase where I was eating tofu all of the time even though I don't like it but since Asians experience less hair loss, it was worth a hail Mary for a while. I think that
@bridgeburn on the hormonal life thread tried the tofu/saw palmetto route before he decided to go on meds used generally only by MtFs. Once a person is on the inside of HRT, she has a real perception that estrogen is the key to all of this, and when you add in the up-to-triple the anagen phase under estrogen, it is hard for me to see many regrowth methods in the absence of HRT. I had great results from polysorbates and finasteride/Duta and minoxidil in terms of maintenance and I urge cis-guys to make maintenance the only goal because finasteride/minoxidil are powerful in terms of maintenance, especially when oral minoxidil is used.
I am testing out the Kirkland method of ingesting oral minoxidil (which contains active ingredient plus alcohol plus one food preservative so unlikely to be harmful, nor does it taste that bad) which I expect to work much better because minoxidil is dependent on the production of certain enzymes in the scalp than many of us lack. After passing through the liver, though, minoxidil seems far more pervasive in its effects and side-effects. But oral minoxidil might be the most efficacious treatment for cis-guys in terms of "regrowth", even up there with Dutasteride. I have so many stacks that it is somewhat difficult to ascribe any particular results. I even derma-roll but I don't think that most MtFs need to. For males, derma-rolling and oral minoxidil might be they only things that actually "regrow" hair.