Vitamin C

Notes from DrKF:

I tend to use l-ascorbic acid because there’s not a lot of data that the much more expensive forms are that much more effective. That said, if taking vitamin C tends to upset your stomach, look for a buffered form, and if you want a few extra methylation adaptogens, many vitamin C products come with extra flavonoids. 

Dosage: 500–1000 mg a day as a baseline, more if you need extra antioxidant or immune support.

Big Bold Health HTB Rejuvenate


HTB Rejuvenate contains several bioactive longevity and immune-supportive nutrients including Himalayan Tartary Buckwheat, vitamin C, quercetin, and luteolin. Tartary buckwheat also contains HMB, an anti-aging compound good for building muscle and supporting brain function.*

Metabolic Maintenance Buffered Vitamin C 500 mg


A powerful antioxidant, vitamin C is a water-soluble vitamin necessary to form collagen in bones, cartilage, muscle and blood vessels.* It also aids in the absorption of iron, supports balanced DNA methylation, and promotes immune balance.*

Metagenics PhytoGanix®


We used this greens powder in our study that is flush with methyl donor and methylation adaptogen nutrients, including powdered versions of various mushrooms, berries, flax seeds, turmeric, and beets. We use greens powders as a high-quality, super-clean, extra bit of plant-based insurance for our patients, too. It covers a lot of bases in one scoop. In our study, participants took one scoop twice per day. 

SBO Probiotics Immune 30 caps


A favorite organic prebiotic, probiotic, and postbiotic blend designed for immune system support, including organic acacia gum, organic elderberry, organic reishi mycelium, organic fermented astragalus root, organic apple cider vinegar, Bacillus coagulans, Saccharomyces boulardii, Bacillus subtilis, Bacillus clausii.