I bought the Vikarah's Mehandhi hair oil and I've been using this oil past 2 weeks (before hair wash, 6 times totally). I find the smell of the oil very herbal and doesn't give any headache issues. The oil is very thick and one can easily sense the herbal sediments in the bottle. Very little oil is needed for a good oil massage (not even 1/4th of the bottle is over till now). After two weeks of use, I can find visible improvements in my hair. It has made my hair decently dark, less frizzy and I notice less hair fall than before. It's truly amazing that I can see results which many other brands fail to keep the promise. Overall, I rate it as an economical and worthy purchase.