Telomeres are structures similar to aglets (the tiny cap at the end of shoelace which keeps the fabric from unravelling) that appear on the ends of the chromosomes. The following two video clips describe how DNA is replicated and how the lagging strand template is corrected for.
Sometimes the "blueprint" (Deoxyribonucleic Acid DNA) in each cell needs to replicated. DNA has two strands. Enzymes uncoil the strands and Ribonucleic Acid (RNA) transports the information to duplicate each strand. Replication in one strand is straightforward ... it starts at one end and finishes at the other. This is called the Leading Strand Template. The second strand (lagging strand template) is a little problematic because the replication process needs to back fill information. In young and healthy DNA this isn't a problem because the very end of the strand is composed of "junk" material. It has no genetic information. But is useful in the process. As long as the Telomere is of sufficient length there is proper replication. As people age, the telomere loses its length until finally there is insufficient substance to replicate.
Telomerase is the enzyme which helps maintain (and possibly build) telomeres. Additional discussion on the subject and sources of supplementation which will assist improving telomerase can be found in the following video.
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Astragalus is POSSIBLY SAFE for most adults when taken by mouth or given intravenously (by IV) under the supervision of a medical professional. Doses of up to 60 grams/day for 4 months have been safely taken by mouth. Doses of 80 grams/day intravenously (by IV) have been safely administered for 4 months. When taken by mouth, astragalus may cause rash, itchy skin, nasal symptoms, or stomach discomfort. However, these events are uncommon. When given by IV, astragalus may cause dizziness or irregular heartbeat...
Pregnancy and breast-feeding: Not enough is known about the safety of astragalus in humans during pregnancy and breast-feeding. However, some research in animals suggests that astragalus can be toxic to the mother and fetus. Stay on the safe side and avoid use.
"Auto-immune diseases" such as multiple sclerosis (MS), lupus (systemic lupus erythematosus, SLE), rheumatoid arthritis (RA), or other immune system conditions: Astragalus might make the immune system more active. This could worsen the symptoms of auto-immune diseases. Avoid using astragalus if you have any of these conditions.