Disclaimer: I am not an expert in Ayurveda by any means. 
Update June 2024: I have been researching Ayurveda extensively since 2020. So, I can now claim to have some knowledge and understanding of this system!
Ayurveda, like Yoga, is seeing a resurgence in popularity. Both as an alternative medicine as well as in skin care. I am going to focus on skin care as that's where my personal interest lies. 
My research on Ayurvedic skin care is entirely based on published papers. Thankfully, there are a few obscure academic groups in India that have published papers on subjects such as chemical composition and biological action of Ayurvedic remedies. In addition, my mother and mother-in-law have passed on to me some personal grooming traditions that they grew up with that are based on Ayurveda. Of course, this knowledge is protocol based and has almost no scientific explanation. Having grown up in India, Ayurvedic methods were part of daily life. I went through the phase of discarding these grooming practices and now have come full circle to adopting some practices primarily because I found scientific backing for some of these methods and ingredients. I have also found that there are some ingredients used in Ayurveda that are "primitively" made - there are much better ways to make them today since we understand what is the exact chemical composition of these substances. I am quite fascinated by Ayurvedic methods - the kashayamas, thailams, Bhasmas, churnas - they have this mysterious, alchemical appeal. But I am careful not to romanticize this approach - I always look for chemical compositions and how they work. In the end, molecular identity is the truth no matter what method you take to get to it. 

Recently, I have been focused on what causes hollowness under the eyes as we age. Mainly because I have them and I don't like it (all that stuff people say politely to me about not looking like a mother of a 15 year old has gone to my head. I am doing yoga to stop being so vain - but that's another story). Anyways, my research led me to a fascinating paper on an Ayurvedic "anti aging" preparation involving cow ghee, flaxseed oil, a resin called Shorea robusta, and Yashada bhasma. The Yashada bhasma caught my attention - it has this mysterious ring to it, doesn't it? Yashada is zinc. Bhasma is ash. So I put the two together and figured that Yashada bhasma must primarily be ZnO or zinc oxide. The paper did not really talk about the composition of this bhasma but the conclusion was that this particular combination of ingredients showed better wound healing and collagen content in skin compared to a control group. I found out that Yashada bhasma is made in a rather elaborate way - see below the materials needed to prepare this bhasma:

Zinc metal is melted, quenched in sesame oil and then treated with a variety of liquids - buttermilk, cow urine, kanji etc. The idea is to treat the metal with acidic (buttermilk) and basic (cow urine) media to enable the end product to be easily incinerated to a nanometer size granular powder. The function of the other herbs is to assist with purification of the zinc. In the end, the composition of the powder was determined to be ZnO with a particle size between 150-800nm. This is basically nano zinc oxide powder that can be found in sunscreens, diaper rash ointments etc. 

It is indeed impressive that all this could be done using commonly available material without a well stocked chemistry lab. Simply amazing. However, would I make nano zinc oxide using this method today? I don't think so. 

So now, let's talk about what ZnO does for skin. I found a very comprehensive paper on a variety of studies done on animals and humans using topical application of ZnO. Since my original goal was to see how to prevent hollow eyes non invasively, I will put this in the context of aging. 

• Aging (including hollow eyes - scientifically called tear trough btw) is caused due to degradation in three major structural elements of the dermis - collagen, elastin (both these are proteins), and glucosaminoglycans (or GAGs - polysaccharides or a kind of complex sugar molecules that bind with water and provide plumpness to skin). 
• Non invasive ways to stay youthful (i.e. no fillers, surgery, lasers ...) is to prevent degradation of the above structural elements and/or promote the production of collagen and elastin.
• Preventative measures focus on using anti-oxidants - free radicals generated by UV photooxidation (i.e. exposure to sun) can degrade collagen. Therefore using antioxidants is a strategy of prevention or delaying degradation of collagen. A plug here - this is why you need the Saroya Natural 20%C serum. Other good antioxidants are vitamin E, and anything containing a class of compounds called polyphenols. Ex. green tea, turmeric, pomegranate peels, etc. 
• Another issue with aging is easy scarring - whether due to hyperpigmentation from sun exposure or adult acne - scars tend to last longer because of low rate of epidermal cell turn over. This is where ZnO could help. Vitamin C also helps fade scars. So a combination of antioxidants and ingredients that help with wound healing could be an effective strategy to delay aging. 
• Topical ZnO can help with wound healing - it seems that this effect is more pronounced in people who are deficient in Zn than in those who are nutritionally balanced.
• Promoting production of collagen - this is harder to do. Compounds that help with collagen production are vitamin A and it's derivatives (retinol) and polypeptides. There are botanicals that are rich in vitamin A derivatives - ex. anything orange - carrot seed oil, sea buckthorn oil, saffron, etc. Here the trick is to ensure that there is enough active ingredient and that the delivery mechanism ensure penetration through the skin. More on this later. 

So it may be beneficial to use products using ZnO - like a sunscreen for example. 

Sources: 
​https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3136177/
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5793244/
https://www.researchgate.net/publication/20881383_Studies_on_zinc_in_wound_healing
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3583892/#R42
​https://www.sciencedirect.com/science/article/pii/S0975947618306727

My philosophy of skin care formulation is to use plant extracts for specific needs. My first experiment was in creating a hair oil infused with hibiscus flowers, amla (gooseberry) and rosemary leaves. The next inspiration for a plant extract came after I unseeded a pomegranate fruit (from a local farm) and was left staring at the peels. I decided to dry them and spent the next few weeks researching pomegranate peels. My research led me to getting to know a class of compounds called polyphenols quite intimately.

Phenols are a class of aromatic compounds (containing a benzene ring and a hydroxy group). 

It turns out that pomegranates (fruit, peels, roots etc), white oak bark and several other plant materials are rich in polyphenols - compounds that have multiple phenol structural units. Below is a further classification of different types of polyphenolics which have different benefits for skin:

Pic courtesy: https://www.researchgate.net/figure/The-classification-of-phenolic-compounds_fig3_295082287
​One of the key properties of polyphenols in general is their exceptional antioxidant properties. They are fantastic scavengers of reactive oxygen species that are generated in our tissues when exposed to harmful UV rays from the sun and lead to various skin disorders, including in the extreme, skin cancer. There are a multitude of other benefits as well as shown in the picture below:

Reference for picture above.
My primary interest is to see how polyphenol topical application can help with skin issues. The picture above indicates the mechanisms by which these compounds can help against aging - photo protection, cell renewal, inhibition of melanin (suppress age spots, melasma?), collagen stimulation, constriction of blood vessels (under-eye dark circles).
One of Saroya Natural's most popular products is the Blemish Control Botanical Serum, containing extracts of three botanicals, pomegranate peel, white willow bark, and Baluchi seed. Pomegranate peel extract is rich is polyphenolic acids (punicalagin acid, ellagic acid) that have photo protection benefits and also rich in tannins which aid skin cells renewal. In other words, perfect for use in an anti-aging product!
The white oak bark extract is rich is quercetin and tannins - which can help with blood vessel constriction and melanogenesis inhibition - i.e. an under-eye dark circle treatment.
Bakuchi seeds are a source of several polyphenols. An example is bakuchiol, an ingredient that has come under the limelight for firming aging skin and helping with acne prone skin. 
One of the challenges with using concentrated amounts of polyphenols is extraction and delivery. A serum or oil is the best medium. To learn about botanical rich oils, read this post.