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Looking at this through science, they can measure hair and determine the dates when someone was given poison with great accuracy. This science has convicted people for murder. Hair grows just <1/2″ a month and it is the same rate for 99.9% of the population. You are not going to be able to speed the growth rate; however, you can help prevent DHT buildup in the follicles. This slows hair loss and may help a portion of the follicles to start producing again. (Only follicles that the DHT damage is not too advanced.) I use some botanical ingredients, but found that peptides are the ticket. See ActivePeptide.com for more info and research DHT/Pattern baldness to understand this further. 

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ngarayeva001 said:

pH is too high. I know some professional chemists on this forum are not persuaded that low pH products are better but 9? At least bring it down to neutral. Citric acid 50% solution. I am curious what caused that pH.

4% of essential oils! These are irritants. Especially peppermint at such a concentration. Bring it down to 0.3% , 0.5% max.

4% of solubiliser is not sufficient for 4% of oil. It’s usually 4:1 depending on the oil.

Is it Disodium EDTA? You can reduce to 0.2%
I can’t see a preservative. Am I missing anything?

I have sensitive skin and even a very small amount of essential oil irritates. I feel that adding them to hair and skin products diminishes a portion of your target market and possibly trigger some negative reviews. 

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I sold shampoo to my clients for many years and did not know that I was being mislead by the makers of professional products. Now, I am questioning everything. So, Salicyclic Acid in dandruff shampoos, Colloidal Oatmeal as anti-irritant have no benefit? 

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So, allantoin, proteins, and oils don’t benefit surfactant containing products. Does that hold true for botanical extracts?

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HI MARINAARTM,
I USE A LOT OF BOTANICAL INGREDIENTS AND HAD SIMILAR ISSUES. I FOUND SOME INFO SEARCHING “HERBS HIGH IN ELECTROLYTES”. THIS IS A LIST THAT I FOUND. ALSO, https://thrivemarket.com/blog/natural-sources-of-electrolytes
• nettles (Urtica dioica)
• oatstraw (Avena sativa)
• red clover (Trifolium pratense)
• alfalfa (Medicago sativa)
• rose hips (Rosa spp.)

I USE THIS EMULSIFYING BLEND THAT IS ALL NATURAL WITH A HIGH ELECTROLYTE TOLERANCE.
https://www.makingcosmetics.com/CreamMaker%C2%AE-MIX_p_115.html

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Perry said:

Sorry, “healthy hair” is just not a straight forward term.  Would you say “healthy shoelace”?  Because hair is exactly as alive as a shoe lace.

But your description of what you consider healthy hair is useful  

1.  Hair looks better - use a conditioner. Silicones are useful for keeping hair held together and making it look more shiny and less dull.

2.  Improving the hair cuticle - this is not possible. Once the cuticle is chipped off the hair, there is nothing you can do to improve the cuticle. What you can do is put a coating on the hair fiber which will flatten down the cuticle making it look, feel, and behave better. Once the coating is gone the hair will revert to its natural, damaged state. However, using silicones like Dimethicone and Cationic polymers like Polyquaternium-10 can improve the hair appearance and feel.

You cannot do anything topically to make the hair grow (except Minoxidil of course if you have hair loss).  But nothing has been proven to make hair grow faster. If it did, it would be a drug.  And if someone had found something that did, it would already be on the market.  Nothing works topically for hair growth.

As @Pharma said, vitamins are a waste of money & will have zero effect on your hair.

Perry is on point. I was a hair stylist for 39 years before this new adventure. I explained damaged hair to clients by telling them to think of hair cuticle like shingles on a roof. If the hair is virgin/ undamaged, the shingles lay flat and appear shiny and smooth. On the other hand, if the hair is damaged, the cuticle is lifted like aged shingles. It is not possible to repair lifted shingles; you must replace the roof. The same holds true for damaged cuticle; once damaged, they cannot be repaired. All one can do is use smoothing agents to help hold the cuticle flat and make it look repaired. Damaged hair only gets repaired when it is cut off.