You can buy different strengths of tinctures as well as dry herbs (dry herbs are 'concentrated'). I bought kudzu powder that is concentrated to 20:1 - so I will need less than if I was taking the 'unconcentrated' form is all.
You can call (or email) the company that made the tinctures to see what their ratios are, or you can just assume that they are 'regular' strength - either way though, the process is the same, because we all need different amounts of things. Start off slow and low and build up slowly until you get a response. Then, depending on what you are using it for (treatment or symptom relief), you will either continue to raise it (for symptom relief) or be careful in adding more because you don't want to herx badly.
Because you are using these for symptom relief, start off slowly (we always want to be careful that there will be no allergic type of reaction), and as you start to get relief from your headaches, raise your dose even more slowly until you find the "sweet spot", where you are taking enough to control or lower the headaches, without causing any other issues.
"So, what exactly do these ratios mean anyway? They are weight of herb to volume of menstruum. That means that if you are preparing a dry plant tincture with a 1:5 ratio, and you have 1 ounce (by weight) of dried herb, you’ll want five ounces (by volume, in your glass measuring cup) of menstruum (alcohol or alcohol/water). If you are preparing a fresh plant tincture at a 1:2 ratio and you have 5 ounces (by weight) of fresh herb then you will need 10 ounces (by volume) of mentruum.
bearmedicineherbals.com/an-introduction-to-tinctures.html