- Hair is made up of protein and a break down of the protein structure will cause hair to thin. Incorporating more protein into one's diet as well as adding strengthening protein products (hydrolyzed protein) to your hair will help to fill in any gaps/spaces that may be in the hair shaft, causing it to appear thicker. *Don't overdo the protein products though because if your hair is not sufficiently "soft AND strong" (protein-moisture balance) you will end up with a whole other set of problems*
- Henna/Cassia - These both mimic protein treatments and coat the hair shaft, causing the hair strand to appear thicker. Both of these treatments (especially henna) may loosen your curl pattern overtime, so it's important to take steps (adding Amla powder, spacing treatments and/or doing just your roots) to prevent this if it's not a desired effect. I know this works because I used henna/cassia treatments to re-thicken areas of my hair that thinned a bit due to medication.
- Styling on dry hair - this is a great option for allowing your hair to appear fuller.
- Applying Castor oil - as you know Castor oil is always the suggestion when someone asks "what can I do to thicken my hair." I know for a fact it works on hair that was once thick since I've used to re-thicken my edges. However, I do not know for sure if it works on "genetically" fine hair. The theory behind Castor oil is that "when rubbed on the scalp, castor oil has restorative properties that not only keep the scalp moisturized, but also help thin hair grow thicker and keep hair from falling out. The Omega-9 fatty acids in castor oil helps to regenerate new hair growth within just a few months." Source
Henna works to build up my puny strands. My strands go from wispy/see-through, to baby doll strands (coarser, fortified and shiny as hell) after a few treatments. If you decide to embark on a henna journey do your research first! Styling on dry hair is another trick I lean on in the cooler months. Works like a charm! Share your tips below!