I discovered internal sun care in a bio shop in Europe. Not on TikTok. Not from an influencer. From a pharmacist who explained, matter-of-factly, that people in her country had been taking carotenoid supplements alongside their morning coffee for years. Not as a trend. As a practice — the way you take a multivitamin, except this one was specifically for skin resilience in the sun. I came from the land of tanning beds, baby oil, and an all-or-nothing mindset — either cover up or take the damage for the tan. I had no idea there was a middle ground, where nutrition could support skin resilience AND the warmth I was chasing. I looked into the research and found decades of peer-reviewed studies I'd never heard of. I started taking it. And eventually, after 10 years working in beauty and health manufacturing, I built a product around it.
What I see flooding American social media right now is almost unrecognizable from what I found in that pharmacy.
This is not new. The trend is.
Indigenous peoples in Central and South America used annatto — a carotenoid-rich plant pigment — for sun protection for at least 3,500 years. North African cultures developed their own traditions around carotenoid-rich oils for the same purpose. European clinical researchers spent decades formalizing what these cultures already practiced: that specific carotenoid compounds, taken consistently, accumulate in skin tissue and support the body's antioxidant defenses against UV-generated oxidative stress.
Most Americans are hearing about internal sun care for the first time right now — through tanning gummies. That's the problem. The real practice never got a proper introduction here. The first impression of this entire category, for millions of people, is the version that replaced the studied ingredients with unstudied ones and traded the original purpose of health for a cosmetic shortcut. When the only version you've ever seen is the knockoff, you don't know there's an original to compare it to.
The ingredient problem
Most tanning gummies rely on L-Tyrosine — a melanin precursor — as their headline active. The claim is that it boosts melanin production and deepens your tan. The problem: published research does not support this at supplement doses. A study in Photochemistry and Photobiology (Agin et al., 1983) found oral tyrosine did not enhance pigmentation in vivo. The FDA has not approved any pills for tanning the skin and considers them unapproved new drugs not shown to be safe and effective (FDA.gov, "Tanning Pills," current as of March 2022).
There's a deeper issue. Your body produces two types of melanin: eumelanin, which absorbs UV and protects, and pheomelanin, which is pro-oxidant — it generates free radicals under UV exposure. People with fair skin naturally produce more pheomelanin. Research published in the Journal of Investigative Dermatology (Smit et al., 2004) found that when tyrosine concentration is increased, lighter skin types show a more pronounced shift toward pheomelanin production. The consumers most likely to buy tanning gummies are the ones whose biology would respond least favorably.
Beyond L-Tyrosine, many of these products contain preformed vitamin A (retinyl palmitate) — a form that bypasses the body's regulatory mechanism and accumulates in the liver at sustained doses — and copper at amounts already covered by a normal diet, with no published evidence supporting its role in deepening a tan.
The format problem
Even when tanning gummies include carotenoids — the one compound class with actual research behind it — the gummy format works against them. Carotenoids are heat-sensitive. Standard gummy manufacturing requires temperatures that degrade these compounds before the product reaches the shelf. You cannot make a cold-process gummy. The format and the active ingredients are fundamentally incompatible.
What the research actually supports
The studied approach to internal sun care doesn't attempt to stimulate melanin production. It works through a different mechanism entirely: plant-based carotenoids that accumulate in the dermal layer of the skin over 8-12 weeks of consistent daily intake, providing antioxidant support where UV-generated free radicals do their damage.
The compounds are well-studied. Astaxanthin has a singlet oxygen quenching capacity approximately 6,000 times that of vitamin C (Nishida et al., Carotenoid Science, 2007). Lycopene supplementation increased the skin's minimal erythemal dose — the UV threshold needed to cause reddening — by 43% from baseline over 12 weeks in a meta-analysis of clinical trials (Dilokthornsakul et al., Thai Journal of Pharmaceutical Sciences, 2018). Multi-carotenoid blends provide broader antioxidant coverage than any single compound at lower individual doses (Heinrich et al., Journal of Nutrition, 2003). Tocotrienols complement carotenoids by interrupting lipid peroxidation chain reactions at a different stage of the UV-induced oxidative cascade.
The result is cumulative, systemic, and operates beneath the skin's surface — the layer sunscreen was never designed to reach. It complements topical UV protection rather than competing with it.
Thousands of years of traditional wisdom. Decades of clinical research. And what the American market produced is a gummy with the wrong ingredients, the wrong format, and a 30-day promise for something that takes 12 weeks.
Consumers deserve to know the difference between a practice with millennia of history and published science behind it, and a trend that swapped the studied ingredients for unstudied ones and called it innovation. The science is not hard to find. It's just being drowned out by better packaging.